Product Documentation

What's New in Previous 11.1 Builds

Oct 19, 2016

The enhancements and changes that were available in NetScaler 11.1 releases prior to Build 49.16. The build number provided below the issue description indicates the build in which this enhancement or change was provided.


  • OAuth Support for Multi-Factor Authentication

    The NetScaler appliance now supports OAuth in a multifactor deployment and for cascading authentication. That is, OAuth can be now be used anywhere in a cascade, in first factor or in any of the factors, and as a fallback authentication policy.

    In earlier releases, OAuth could be used only for the first factor.

    Note: To use OAuth in a factor other than the first, you must register an authentication FQDN with the application because OAuth must start and end on the same virtual server.

    [From Build 41.26, 47.14] [#611735, 572701, 572705]

  • At present, customization of the Portal pages is only offered for Gateway virtual server. Admins often have the same branding requirements for the Login page that is presented on the Authentication virtual server page - for example, tmindex.html. This enhancement supports Portal Theme binding for the Authentication virtual server.

    [From Build 47.14] [#581544, 475585, 552072, 606858, 619869]

  • This enhancement allows the user to Preview the custom portal themes by binding it to an Authentication virtual server. Earlier this support was only present for Gateway virtual servers.

    [From Build 47.14] [#620908]

AAA-TM/NetScaler Gateway

  • With this enhancement, NetScaler now supports GET requests from SAML SPs.

    [From Build 47.14] [#564947, 590768]

  • This enhancement provides NetScaler, which acts as a SAML IDP, to pass the SPID value to the SP in an IDP initiated connection.

    [From Build 47.14] [#582265]

Admin Partitions

  • On a partitioned NetScaler appliance, you can now bind a VLAN as a dedicated VLAN for a particular partition or as a shared VLAN across multiple partitions.

    [From Build 41.26, 47.14] [#581671]


  • PBR Support for Cluster

    Partially striped and spotted policy based routes (PBR) are now supported on a Layer 3 NetScaler cluster.

    [From Build 41.26] [#611938]


  • PBR Support for Cluster

    Partially striped and spotted policy based routes (PBR) are now supported on a Layer 3 NetScaler cluster.

    [From Build 47.14] [#611938]


  • Support for EDNS0 Client Subnet

    The NetScaler appliance now supports the EDNS0 client subnet (ECS) option in deployments that include the NetScaler appliance configured as an ADNS server authoritative for a GSLB domain. In the deployment, if you use static proximity as the load balancing method, you can now use the IP subnet in the ECS option, instead of using the LDNS IP address, to determine the geographical proximity of the client. In the case of proxy mode deployment, the appliance forwards a DNS query with the ECS option as-is to the back-end servers and does not cache DNS responses that include the ECS option.

    Note: The EDNS0 client subnet (ECS) option is not applicable for some other deployment modes, such as ADNS mode for non-GSLB domains, resolver mode, and forwarder mode. In such modes, the ECS option is ignored by the NetScaler appliance.

    [From Build 41.26, 47.14] [#457159]

Load Balancing

  • Closing Monitor Connections at Service and Service Group Level

    A parameter named monConnectionClose has been added at the service and service group levels. If this parameter is not set, the monitor connection is closed by using the value set in the global load balancing parameters. If this parameter is set at the service or service group level, the monitor connection is closed by sending a connection termination message, with the FIN or RESET bit set, to the service or service group.

    [From Build 41.26, 47.14] [#607661]

  • NetScaler appliances now support load balancing virtual servers of type SSL_FIX, which can load balance FIX-protocol requests at the FIX message level and allow FIX-specific session persistence.

    [From Build 41.26, 47.14] [#634096]

  • Improved Support for Persistency

    In certain cases, cores of a NetScaler appliance might not be synchronized, because a core-to-core monitoring or service update has not reached one of the cores. For example, if the core that owns persistency has not received notification that a service is DOWN, that service remains in the persistency table. If a traffic-owner core that has been notified that the service is DOWN finds it in the persistency table, it requests a different service from the persistency-owner core, so that it can redirect the request. Before this enhancement, if the persistency owner returned the same service, the traffic-owner core dropped the user's request. Now, instead of immediately dropping the request, the traffic owner queries the persistency owner a second time. Sending the second query usually gives the persistency owner enough time to have received the update, in which case it returns a different service.

    [From Build 47.14] [#571771]

  • Setting SSL Parameters on a Secure Monitor

    A monitor inherits either the global settings or the settings of the service to which it is bound. If a monitor is bound to a non-SSL or non-SSL_TCP service, such as SSL_BRIDGE, you cannot configure it with SSL settings such as the protocol version or the ciphers to be used. Therefore, in such deployments, SSL-based monitoring of the back-end servers is ineffective.

    This enhancement gives you more control over SSL-based monitoring of back-end servers, by enabling you to bind an SSL profile to a monitor. An SSL profile contains SSL parameters, cipher bindings, and ECC bindings. For example, you can set server authentication, ciphers, and protocol version in an SSL profile and bind the profile to a monitor. Note that to perform server authentication, you must also bind a CA certificate to a monitor. To perform client authentication, you must bind a client certificate to the monitor. New parameters for the "bind lb monitor" command enable you to do so.

    Note: The SSL settings take effect only if you add a secure monitor. Also, the SSL profile type must be BackEnd.

    SSL profiles can be bound to the following monitor types:

    - HTTP

    - HTTP-ECV

    - TCP

    - TCP-ECV


    To specify an SSL profile while adding a monitor by using the command line

    At the command prompt, type:

    add lb monitor <monitorName> <type> -secure YES -sslprofile <string>

    set lb monitor <monitorName> <type> -secure YES -sslprofile <string>


    add ssl profile prof1 -sslProfileType BackEnd

    add lb monitor mon1 HTTP -secure YES -sslprofile prof1

    To bind a certificate-key pair to a monitor by using the command line

    At the command prompt, type:

    bind monitor <monitor name> -certkeyName <string> [(-CA [-crlCheck ( Mandatory | Optional ) | -ocspCheck ( Mandatory | Optional )]

    [From Build 47.14] [#506771]

  • Support for Load Balancing Profile

    A load balancing configuration has a large number of parameters, so setting the same parameters on a number of virtual servers can become tedious. You can now set load balancing parameters in a profile and associate this profile with virtual servers, instead of setting these parameters on each virtual server.

    For more information about load balancing profiles, see

    [From Build 47.14] [#353669]

  • Closing Monitor Connections at the Service Group Level

    A parameter named monConnectionClose has been added at the service group level. If this parameter is not set, the monitor connection is closed by using the value set in the global load balancing parameters. If this parameter is set at the service group level, the monitor connection is closed by sending a connection termination message, with the FIN or RESET bit set, to the service group.

    For more information about closing monitor connections at the service group level, see

    [From Build 47.14] [#628111]

  • Configuring an HTTPS Virtual Server to accept HTTP Traffic

    You can now configure an HTTPS virtual server to also process all HTTP traffic. That is, if HTTP traffic is received on the HTTPS virtual server, the appliance internally prepends "https://" to the incoming URL or redirects the traffic to another HTTPS URL, depending on the option configured.

    For more information about configuring an HTTPS virtual server to accept HTTP traffic, see

    [From Build 47.14] [#570157]

  • Secure FTP Monitoring Support

    The NetScaler appliance now supports secure FTP monitoring. That is, you can now configure the appliance to send secure FTP probes to your FTP services.

    For more information about secure FTP monitoring support, see

    [From Build 47.14] [#237766]

  • Required Unbind Operation Prevents Accidentally Disabling a Virtual Server

    Accidentally deleting a service or service group that is bound to a virtual server can result in the virtual server going DOWN. With this release, you cannot delete a service or service group that is bound to a virtual server until you first unbind it from the virtual server.

    [From Build 47.14] [#258327]


  • Handle Multiple NITRO Calls in a Single Request

    A new API, macroapi, can be used to configure a set of homogeneous or heterogeneous objects in a single API request. The query parameter "onerror" specifies the action to be taken if an error is encountered. Possible values for this parameter are exit, continue, and rollback.

    For more information about this NITRO API, see

    [From Build 41.26, 47.14] [#598559]

  • Automate NetScaler Upgrade and Downgrade with a Single API

    A new API, install, can be used to upgrade or downgrade a NetScaler appliance. You can specify a local or remote location for the build file used to upgrade or downgrade the appliance.

    For more information about this NITRO API, see

    [From Build 41.26, 47.14] [#598557]

  • Simplify Management Operations with an idempotent API

    You can add or update resources seamlessly, with a single API, by using the new "idempotent" query parameter. Previously, an attempt to add a resource that was already configured, or to update a resource that was not yet configured, caused an error.

    Now, if you include "idempotent=yes" in a POST request, NITRO executes the request in an idempotent manner.

    For more information about this API, see

    [From Build 41.26, 47.14] [#601351]

  • Retrieve Bindings in Bulk

    You can use a bulk GET API to fetch bindings of all the entities of a given entity type.

    For example, you can fetch bindings of all the load balancing virtual servers in one call instead of by using multiple GET by "name" calls.

    For information about this NITRO API, see

    [From Build 41.26, 47.14] [#600350]

NetScaler CLI

  • 1) A new system parameter was added. "totalAuthTimeout" - the default value is 20 seconds, minimum value 5 seconds and maximum 120 seconds. set system parameter - totalAuthTimeout <positive_integer>

    2) A new aaa radius param was added. authservRetry - the default value is 3 retries, minimum 1 and maximum 10 retries can be configured.

    set aaa radiusParams - authservRetry <positive_integer>

    [From Build 47.14] [#492179]

NetScaler CPX

  • Container-Based Application Delivery Controller

    Citrix NetScaler CPX is a container-based application delivery controller that can be provisioned on a Docker host. NetScaler CPX enables customers to leverage Docker engine capabilities and use NetScaler load balancing and traffic management features for container-based applications. You can deploy one or more NetScaler CPX instances as standalone instances on a Docker host. For more information, see About NetScaler CPX.


    [From Build 47.14] [#627953, 632576]

NetScaler GUI

  • High Availability Status Information in the Top Pane

    The top pane of the NetScaler GUI now displays the High Availability status of the node. This instant visibility of HA status helps you monitor the HA configuration efficiently.

    [From Build 47.14] [#423777, 466239, 582803]

  • Diagnostic of Start New Trace and Support Stop Running Trace

    Starting and stopping nstrace are now separate options in the NetScaler GUI. As a result, it is easier to stop a running trace and download the results.

    Navigate to System > Diagnostics and select "Start New Trace" or "Stop Running Trace."

    [From Build 47.14] [#564499, 565594]

  • Improved IPv4 Address Fields

    IPv4 address fields now do not have dot separators, which improve the usability of these fields.

    [From Build 47.14] [#610522]

  • GUI Wizard for CloudBridge Tunnel Configuration

    The NetScaler GUI now provides a wizard for easy configuration of a CloudBridge Connector tunnel between the NetScaler appliance and a Virtual Private Gateway on Amazon AWS.

    [From Build 47.14] [#602678]

  • Support for High Availability Configuration for a Secure Access Only Remote node

    The NetScaler GUI now supports configuration of a node in High Availability (HA) mode even if the Secure Access Only option is enabled for the NetScaler IP (NSIP) address of the other node in the HA pair.

    [From Build 47.14] [#624858]

  • SSL Certificate Management GUI Enhancements and Changes

    1) Links to the following pages have been removed from the SSL overview page:

    - Create RSA Key

    - Create DSA Key

    - Create CSR

    - Create Certificate

    To access these pages, navigate to Traffic Management > SSL > SSL Files.

    2) Server, client, and CA certificates are now segregated. When you bind a certificate to an SSL end point, only the list of appropriate certificates appears. For example, when you bind a server certificate to an SSL virtual server, only the server certificates are listed. In earlier releases, all the certificates, including client and CA certificates, were listed.

    3) You can configure an SNMP trap from the "Install Certificate" page to send a notification when the certificate is about to expire. For a valid certificate in the notification period, status changes to yellow. For an expired certificate, status changes to red.

    4) "Certificate format" field has been removed, because the format (PEM/DER/PFX/Bundle) is automatically detected by the software during certificate installation. Also, if the file is not password protected, you are not prompted for a password.

    5) The key files, CSR files, and certificate files are segregated onto different tabs for ease of use.

    6) The SSL certificate overview page now explains the end-to-end flow of managing certificates on your appliance.

    [From Build 47.14] [#612894]

  • Tabular, One-page Application Firewall Wizard

    The new, tabular, Application Firewall wizard improves flexibility and accelerates the completion of tasks. You can go back to any page and edit any details about profiles, policies, and signatures, and skip screens that are not mandatory. In addition, all resource-consuming tasks, such as submission and binding, are completed after you click Finish.

    For more information about the wizard, see

    [From Build 47.14] [#587433, 557185, 619712]

  • Icons for Action and Information Menus

    Two new icons in the NetScaler GUI display action menus and information menus. If you are in a window with detail-view rows, and the rows have actions, you can now display the action menu by clicking the action icon in that row, rather than right-clicking the row.

    Similarly, you can display the info menu by clicking the info icon.

    [From Build 47.14] [#614868]

  • To test connectivity from a subnet IP (SNIP) address to another IP address, you can now select the source address from a list of SNIP addresses instead of typing the SNIP address. If the SNIP address is not in the list, you can add it. To use this feature, navigate to System > Diagnostics. In Utilities, select ping or ping6, and then select "SNIP."

    [From Build 47.14] [#597501]

  • In the load balancing visualizer, you can now seamlessly migrate the configuration of a service to all the services bound to the virtual server. To copy the settings of one service to all the other services, in the visualizer, click "Configuration Sets," select a service, and then click "Migrate Config."

    [From Build 47.14] [#619498]

  • The NetScaler appliance was enhanced so Negotiate Authentication is available for VPN Virtual Servers. The GUI reflects this under the NSG > Policies > Authentication node.

    [From Build 47.14] [#600708]

  • Usability Support to Upload Technical Support Collector Archive

    You can now automatically upload the technical support collector archive to Citrix Support servers.

    Navigate to System > Diagnostics > Technical Support Tools > Generate support file, and select Upload the Collector Archive. Type your user credentials and click Run.

    [From Build 47.14] [#614285, 620953]

NetScaler Gateway

  • Non-Blocking LDAP SSL/TLS authentication support added. This enhancement reduces the authentication bottleneck to prevent delayed/denied user logons.

    [From Build 47.14] [#609519]

  • Multi-factor authentication enhances the security of an application by requiring users to provide multiple proofs of identification to gain access. The NetScaler appliance provides an extensible and flexible approach to configuring multi-factor authentication. This approach is called nFactor authentication.

    This multi-factor authentication capability is now available for all Gateway use cases as well

    [From Build 47.14] [#597011]

  • The STA and nextHop VPN parameters can now be configured using FQDN instead of just the IP address. The STA server is used for authorizing ICA connections and NextHop is used for specifying the second-hop in a "double-hop" Gateway deployment.

    [From Build 47.14] [#560476, 566511]

  • This enhancement provides the ability to a clear config basic command so it will not erase the TACACS related configuration.

    [From Build 47.14] [#515227]

  • The Unified Gateway Visualizer provides an easy visual representation of the configurations done using the Unified Gateway Wizard. It shows the pre-authentication and authentication policies, Content Switching, NetScaler Gateway and Load Balancing virtual servers, XA/XD apps, Web and SaaS apps.

    Along with the visual representation, admins can use this Visualizer for below purposes:

    1. Edit the Unified Gateway configuration

    2. View various policies, like Session Policy, Rewrite and Responder Policy etc.

    3. Add new configuration, like policies, Web apps, SaaS apps.

    4. View the state of the Load Balancing, vservers and services, NetScaler Gateway vserver and Content Switching vserver

    [From Build 47.14] [#625465]

  • This enhancement provides the ability for the end-user to specify the RDP destination instead of the administrator pre-configuring it. The Gateway portal provides the option to provide a field where the user can enter the RDP destination. The user can launch the RDP connection by entering the destination info. This option is administrator-controlled, so that only a specific group of users can be provided with this capability.

    [From Build 47.14] [#527779]

  • This enhancement allows an admin to view the different LoginSchemas present in NetScaler. This is done from the NetScaler admin GUI under LoginSchema Profiles configuration. Use the following path to see the LoginSchemas: Configuration>Security>AAA -Application Traffic>Login Schema>Profiles.

    [From Build 47.14] [#617921]

  • This enhancement introduces support for a new key transport algorithm(RSA-V1_5). The RSA-V1_5 can used to encrypt SAML assertions along with RSA-OAEP.

    [From Build 47.14] [#580078]

  • This enhancement provides NetScaler the ability to use the FIPS SSL key to perform SAML signing. For all customers looking for FIPS compliant devices and SAML based user identity, this enhancement is very useful.

    [From Build 47.14] [#346843, 457851, 553143]

  • The NetScaler appliance inserts an NS_ESNS cookie for page tracking (for showing a waterfall chart) when AppFlow is enabled. Cookie insertion was controlled by the clientSideMeasurements option in the appflow action in release 10.5, but in release 11.0 the default became to always insert the cookie when appflow is enabled. Android receiver (HTTP client) was not able to handle this cookie. This fix adds the Enable/Disable page tracking (cookie insertion) option to the appflow action.

    You can now enable or disable Page tracking feature from NetScaler Insight Center.

    To perform this action, navigate to Configuration > System > Appflow > Actions. Edit an AppFlow action name, and select the Page Tracking check box.

    [From Build 47.14] [#613351, 598478, 608448]

  • In this release, the UI experience for Windows plugin has been improved. New capabilities like the drop-down list of connected Gateway servers has been added. Also, more status information, like progressive bars during download or VPN connection establishment, has been added.

    [From Build 47.14] [#604407]

  • The RfWeb UI Gateway feature provides users a consistent portal experience when accessing corporate apps and resources from inside corporate network or remotely from Internet. The StoreFront Receiver for the Web User Interface (RfWeb UI) is now available from NetScaler Gateway natively. This UI is provided as a portal theme that can be bound to Gateway virtual server/global to get the exact same UI experience as that of StoreFront.

    By using the RfWeb UI theme, customers can consolidate all types of applications - Citrix virtual apps/desktops, Enterprise webapps, SaaS/cloud apps, RDP resources and SSL VPN apps - on the Gateway portal with the same experience as that of StoreFront.

    This feature supported from StoreFront 3.6 onwards.

    [From Build 47.14] [#604419, 522033]

  • Framehawk technology is used to provide the best end-user experience on Citrix virtual apps/desktops (ICA/HDX connections) on any type of network. NetScaler Gateway now supports ICA/HDX connections based on Framehawk with double STA tickets. This helps to maintain fault tolerance from STA servers.

    [From Build 47.14] [#603904, 615718]

  • The AlwaysOn feature enables Gateway plugins to detect the location of the user (intranet/corporate vs. Internet/extranet) and establish the VPN connection automatically. The Administrator controls the plugin behavior to establish the connections to all locations or only from internet. Also, controls are provided to enable/disable the user's ability to logoff from the Gateway and network behavior when the VPN connection has not been established.

    This feature is very useful for enhancing the end-user experience by eliminating the manual step of establishing/terminating the VPN connection. It is also very helpful for customers looking to maintain strict security controls on remote access users by tunneling all traffic through the Gateway. The feature is supported on the Windows platform.

    [From Build 47.14] [#595825]

  • In this release, RDP Proxy connections use the same IP and port as that of the Gateway vserver. Hence, there is no need to open any new IP or port on the uplink firewalls.

    [From Build 47.14] [#603894]

  • This enhancement supports SAML SP Artifact Binding flows for nfactor.

    [From Build 47.14] [#554999]

  • This enhancement provides NetScaler, which is acting as SAML IDP, the capability to sign the entire SAML response along with the assertion.

    [From Build 47.14] [#620844]

  • This enhancement allows the binding of DNS-based Rewrite or Responder policies to Gateway VPN virtual servers. This enhancement can filter-in or filter-out DNS traffic going through the SSL VPN.

    [From Build 47.14] [#599689]

  • During certificate authentication, if only one certificate is present on a client's computer, it is now chosen by default. The user is no longer prompted to select a certificate. However, if two or more certificates are present, the user is prompted to select a certificate. Additionally, if the certificate is successfully authenticated, the certificate preference is automatically saved. The preference is removed if the certificate authentication later fails, or if the user manually clears the saved certificate option by setting NetScaler Gateway Plugin preferences.

    [From Build 48.10] [#639192]

NetScaler Insight Center

  • You can now assign IPv4, IPv6, or both IP addresses to your NetScaler Insight Center server. To assign a new IP address, navigate to Configuration > System > Network Configuration, and select IPv4, IPv6, and/or both and specify the network parameters.

    If you specify both IPv4 and IPv6 addresses, you can access the NetScaler Insight Center by using any one of the IP addresses.

    [From Build 47.14] [#582943]

  • You can now view the current session details from the Geomaps section in HDX Insight.

    [From Build 47.14] [#606188]

  • The following thin clients now support HDX Insight:

    -WYSE Windows based thin clients

    -WYSE Linux based thin clients

    -WYSE ThinOS based thin clients

    -10Zig Ubuntu based thin clients

    [From Build 47.14] [#614892, 550997, 604388, 620422, 632370]

  • You can now search for a specific application, client, or server by using the Search option in Web Insight.

    [From Build 47.14] [#590782]

  • You can now use NetScaler Insight Center to monitor NetScaler integrated caching. Cache Insight enables you to see and monitor the various actions performed by the NetScaler cache.

    [From Build 47.14] [#498439]

  • You can now enable, edit, or clear AppFlow on multiple virtual servers simultaneously. To perform these actions, navigate to Configuration > Inventory and open your NetScaler Instance. Select the virtual servers and click Enable AppFlow, Edit AppFlow Settings, or Clear AppFlow Configuration, respectively.

    [From Build 47.14] [#534805]

  • In HDX Insight, you can view a diagrammatic representation of a client's current session details.

    Navigate to HDX insight > Users, and in the Current Sessions section, click the Diagram button to display details such as Client IP address, NetScaler IP address, Origin Server IP address, Country, Region, Session ID, and Client Version.

    [From Build 47.14] [#606189]

  • You can now view the client's machine name for any user session in HDX Insight.

    [From Build 47.14] [#606187]

  • You can now view USB event reports of a user's active sessions on HDX Insight. You can view details such as USB Status, Number of USB Instances Accepted, Number of USB Instances Rejected, and Number of USB Instances Stopped.

    [From Build 47.14] [#549746]

  • 1)You can now use NetScaler Insight Center to monitor and manage your incoming traffic's IP Reputation.

    2)You can now enable/disable AppFlow for Security insight separately from the Enable AppFlow option. To Enable or Disable Appflow, navigate to Configuration > Inventory and open your NetScaler Instance. Select the virtual servers and click Enable AppFlow and select the Security Insight option.

    [From Build 47.14] [#635528]

  • NetScaler Insight Center can now use the X-Forwarded-For header to display the actual client IP address instead of the IP address of the proxy that forwarded the request.

    [From Build 47.14] [#541439]

NetScaler SDX Appliance

  • Disable physical interface on the NetScaler SDX appliance

    If you are not using any of the physical interfaces on a NetScaler SDX appliance, you can now disable them by using Management Service.

    For more information, see

    [From Build 47.14] [#577800]

  • Ability to generate partition MAC addresses

    You can now generate partition MAC addresses on a NetScaler SDX appliance and use them to configure admin partitions on a NetScaler instance on the appliance.

    For more information, see

    [From Build 47.14] [#576124]

  • Updated Encryption Method

    The management service now uses the SHA512 encryption method to encrypt the nsrecover passwords stored on the SDX appliance.

    [From Build 47.14] [#576379, 578112]

  • Support to display the details for Out of Service state

    Management Service now displays the reason for Out Of Service state of the NetScaler instances when you mouse over on them in the dashboard.

    [From Build 47.14] [#393721]

  • For any operations that require NetScaler SDX appliance reboot, Management Service now detects the unsaved configurations on the NetScaler instances and prompts you to save them.

    [From Build 47.14] [#581603]

  • Support to transfer backup files to an external backup server

    You can now configure a NetScaler SDX appliance to transfer the backup files to an external backup server by using FTP, SFTP, and SCP.

    For more information, see

    [From Build 47.14] [#581604, 576259]

  • Option to Disable nsrecover Login Account

    Using the Management Service interface, you can now disable the nsrecover login account. To disable the nsrecover login account, navigate to "Configuration > System > Configure System Settings" and clear the "Enable nsrecover Login" check box.

    [From Build 47.14] [#576375]

  • Option to Set CLI Prompt

    You can now customize the CLI prompt of the Management Service.

    [From Build 47.14] [#526292]

  • Ability to configure SSL Ciphers to Securely Access the Management Service

    You can select SSL cipher suites from a list of SSL ciphers supported by SDX appliances, and bind any combination of the SSL ciphers to access the Management Service securely through HTTPS

    [From Build 47.14] [#530232]

  • IPv6 Support

    SDX Appliances now support IPv6 addresses in the following configurations:

    - SDX Network Configuration

    - Server Configuration

    - Authentication Server

    - Syslog Server

    - SNMP Server

    - Notification Server

    - SNMP Interface Configuration

    - NetScaler Configuration (If provisioning uses IPv6 address.)

    [From Build 47.14] [#531419, 251566]

  • Static Routes Support for Management Service

    You can now specify an IP address as a static route when provisioning a NetScaler instance. The instance then uses this address, instead of the default route, to connect to the Management Service.

    [From Build 47.14] [#498445]

  • Option to add Network Subnet instead of specific IP address or hostname of the SNMP Manager.

    You can now add the network subnet of the SNMP manager instead of specifying the SNMP Manager's IP address or host name. If you do not configure at least one SNMP manager, the appliance accepts and responds to SNMP queries from all IP addresses on the network. If you configure one or more SNMP managers, the appliance accepts and responds only to SNMP queries from those specific IP addresses or IP addresses from that subnet.

    For more information, see

    [From Build 47.14] [#622893, 440103]

  • Support to send selective system notification through email or SMS

    You can now send notifications to communicate with selected groups of users for a number of system-related functions.

    [From Build 47.14] [#434771]

  • Cascade Authentication for System Users

    You can now cascade external authentication servers to have a continuous, reliable authentication process in place to authenticate and authorize external users. If authentication fails on the first authentication server, the NetScaler SDX Management Service attempts to authenticate the user by using the second external authentication server, and so on.

    You can cascade up to 32 external authentication servers.

    For more information, see

    [From Build 47.14] [#611319, 612186]

  • Support to Encrypt Backup Files

    The Management Service now provides an option to encrypt the backup files.

    For more information, see

    [From Build 47.14] [#576381]

  • Option to select the protocol for NetScaler and Management Service communication

    Using the Admin profile, you can now specify whether the Management Service and the NetScaler VPX instance should communicate with each other only over a secure channel or by using HTTP.

    [From Build 47.14] [#616436, 621482]

NetScaler User Interface

  • What is added?

    The XenApp and XenDesktop wizards provide a new authentication configuration flow, and a new configuration download option to automatically import the NetScaler Gateway configuration required for StoreFront. In addition, all sections in the wizard have been refined to make overall deployment configuration much simpler. The following new configuration options are provided:

    1. You can use a FQDN to connect to a virtual server, instead of using the IP address. A Gateway FQDN virtual server can forward traffic to a NetScaler Gateway virtual server IP address.

    2. StoreFront FQDN is changed to StoreFront URL ( HTTP / HTTPS ).

    3. The Authentication section now supports the following authentication types for StoreFront: Domain, RSA, SMS, Smart Card and RSA+ Domain.

    4. XenApp and XenDesktop wizard dashboards provide a button that downloads the configuration file. This file only contains the first NetScaler Gateway successfully created configuration.

    The following items have been removed from the XenApp and XenDesktop wizards:

    1. Load Balancing configuration section under the StoreFront settings

    2. Load Balancing configuration section under the Authentication section

    3. XenApp Farm section

    4. Advanced configuration options for deploying StoreFront

    What is expected in case of an upgrade?

    When a NetScaler appliance is upgraded to a build with a new XenApp and XenDesktop wizard, any deployments created in the previous version retain the old wizard view and functionality. New NetScaler Gateway deployment for StoreFront will use the new flow.

    [From Build 48.10] [#649743]

NetScaler VPX Appliance

  • New license for NetScaler VPX on ESX and KVM platforms

    40G license is now available for NetScaler VPX appliance on ESX and KVM platforms

    For more information about recommended interfaces and performance details, refer to the latest VPX datasheet.

    [From Build 47.14] [#623179]


  • NetScaler Support for Microsoft Direct Access Deployment

    Microsoft Direct Access is a technology that enables remote users to seamlessly and securely connect to enterprise's internal networks, without the need to establish a separate VPN connection. Unlike VPN connections, which require user intervention to start and close connections, a Direct Access-enabled client connects automatically to the enterprise's internal networks whenever the client connects to the Internet.

    Manage-Out is a Microsoft Direct Access feature that allows administrators inside the enterprise network to connect to Direct Access clients outside the network and manage them (for example, performing administration tasks, such as scheduling service updates, and providing remote support.

    In a Direct Access deployment, NetScaler appliances provide high availability, scalability, high performance, and security. NetScaler load balancing functionality sends client traffic through the most appropriate server. The appliances can also forward the Manage-Out traffic through the right path to reach the client.

    [From Build 41.26, 47.14] [#612455]

  • Graceful Restart for Dynamic Routing Protocols

    In a non-INC high availability (HA) setup in which a routing protocol is configured, after a failover, routing protocol is converged and routes between the new primary node and the adjacent neighbor routers are learned. Route learning take some time to complete. During this time, forwarding of packets is delayed, network performance might get disrupted, and packets might get dropped.

    Graceful restart enables an HA setup during a failover to direct its adjacent routers to not remove the old primary node's learned routes from their routing databases. Using the old primary node's routing information, the new primary node and the adjacent routers immediately start forwarding packets, without disrupting network performance.

    The following routing protocols support graceful restart in a non-INC high availability setup:

    - Border Gateway Protocol (BGP)

    - IPv6 Border Gateway protocol (IPv6 BGP)

    - Open Shortest Path First (OSPF)

    - IPv6 Open Shortest Path First (OSPFv3)

    [From Build 41.26, 47.14] [#571033]

  • IPv6 Support in Active-Active Mode using VRRP

    NetScaler Appliances Support VIP6 Addresses in Active-Active Deployments.

    An active-active deployment, in addition to preventing downtime, makes efficient use of all the NetScaler appliances in the deployment. In an IPv6 active-active deployment mode, the same VIP6 address is assigned to every NetScaler appliance in the configuration, but with different priorities, so that a given VIP6 can be active on only one appliance at a time.

    The active VIP6 address is called the master VIP6, and the corresponding VIP6s on the other NetScaler appliances are called the backup VIP6s. If a master VIP6 fails, the backup VIP6 with the highest priority takes over and becomes the master VIP6. All the NetScaler appliances in an active-active deployment use the Virtual Router Redundancy Protocol (VRRP) to advertise their VIP6s and the corresponding priorities at regular intervals.

    NetScaler appliances in active-active mode can be configured so that no appliance is idle. In this configuration, different sets of VIPs are active on each appliance.

    The following features of IPv4 active-active configuration are also supported for IPv6 active-active configuration:

    * Preemption

    * Delaying preemption

    * Sharing

    * Changing VIP address priority automatically

    [From Build 41.26, 47.14] [#553570]

  • Using NULL Policy Based Routes to Drop Outgoing Packets

    Some situations might demand that the NetScaler appliance drops specific outgoing packets instead of routing them, for example, in testing cases and during deployment migration. NULL policy based routes can be used to drop specific outgoing packets. A NULL PBR is a type of PBR that has the nexthop parameter set to NULL. The NetScaler appliance drops outgoing packets that match a NULL PBR. For more information, see

    [From Build 47.14] [#451632]

  • Logging Start Time and Connection Closure Reasons in RNAT Log Entries

    For diagnosing or troubleshooting problems related to RNAT connections, the NetScaler appliance now logs the following additional information:

    - Start time of the RNAT session.

    - Reason for closure of the RNAT session. The NetScaler appliance logs closure reason for TCP RNAT sessions that do not use the TCP proxy (TCP proxy disabled) of the appliance. The following are the type of closure reasons that are logged for TCP RNAT sessions:

    -- TCP FIN. The RNAT session was closed because of a TCP FIN sent by either the source or destination device.

    -- TCP RST. The RNAT session was closed because of a TCP Reset that was sent by either the source or destination device.

    -- TIMEOUT. The RNAT session timed out.

    For more information, see

    [From Build 47.14] [#609410]

  • Adding Default Route for the changed NSIP address Before a Restart

    If you change the NSIP address of a NetScaler appliance, you can now add a default route to the new address's subnet before restarting the NetScaler appliance. This change makes the new NSIP address accessible from other networks after the appliance is restarted.

    In previous releases, if the subnet address of the new NSIP address is different from the previous one, you cannot add a default route for this new subnet until you restart the appliance. Because of this restriction, the new NSIP address is unreachable from other networks after a restart.

    For more information, see

    [From Build 47.14] [#551505]

  • Setting the MTU on the NSVLAN

    By default, the MTU of the NSVLAN is set to 1500 bytes. You can now modify this setting to optimize throughput and network performance. For example, you can configure the NSVLAN to process jumbo frames. For more information, see

    [From Build 47.14] [#425950]

  • NITRO API Support for Dynamic Routing

    NetScaler appliances now support NITRO API for configuring dynamic routing protocols.

    [From Build 47.14] [#626083]

  • Network Service Header support for Service Function

    Network Services Header (NSH) is a new standard that enables the Service Function Chaining (SFC) architecture. NSH enables you to define the service chain paths and forward the data-plane traffic through multiple service nodes in a dynamic and fail-proof manner.

    A NetScaler appliance can now play the service-function role in a SFC architecture. The NetScaler appliance receives packets with Network Service headers and, upon performing the service, modifies the NSH bits in the response packet to indicate that the service has been performed. In that role, the appliance supports symmetric service chaining with features (for example, INAT, TCP and UDP load balancing services, and routing). The NetScaler appliance as service-function does not support IPv6 and Reclassification.

    [From Build 47.14] [#593459]

  • Configuring Source IP Persistency for Backend Communication

    By default, for a load balancing configuration with the USIP option disabled and a net profile bound to a virtual server or services or service groups, the NetScaler appliance uses the round-robin algorithm to select an IP address from the net profile for communicating with the servers. Because of this selection method, the IP address selected can be different for different sessions of a specific client.

    Some situations require that the NetScaler appliance sends all of a specific client's traffic from the same IP address when sending the traffic to servers. The servers can then, for example, identify traffic belonging to a specific set for logging and monitoring purposes.

    The source IP persistency option of a net profile enables the NetScaler appliance to use the same address, specified in the net profile, to communicate with servers for all sessions initiated from a specific client to a virtual server. For more information,

    [From Build 47.14] [#530670]

  • Extending VLANs from Multiple Enterprises to a Cloud

    CloudBridge Connector tunnels can now be used to extend an enterprise's VLAN to a cloud. VLANs extended from multiple enterprises can have overlapping VLAN ID. You can now isolate each enterprise's VLANs, by mapping them to a unique VXLAN in the cloud. On a NetScaler appliance, which is the CloudBridge connector endpoint in the cloud, you can configure a VXLAN-VLAN map that links an enterprise's VLANs to a unique VXLAN in the cloud. VXLANs now support VLAN tagging for extending multiple VLANs of an enterprise from CloudBridge Connector to the same VXLAN.

    [From Build 47.14] [#499295]

  • Stateful Connection Failover Support for RNAT

    Connection failover helps prevent disruption of access to applications deployed in a distributed environment. The NetScaler appliance now supports stateful connection failover for connections related to RNAT rules in a NetScaler High Availability (HA) setup.

    In an HA setup, connection failover (or connection mirroring) refers to the process of keeping an established TCP or UDP connection active when a failover occurs. The primary appliance sends messages to the secondary appliance to synchronize current information about the RNAT connections. The secondary appliance uses this connection information only in the event of a failover. When a failover occurs, the new primary NetScaler appliance has information about the connections established before the failover and hence continues to serve those connections even after the failover. From the client's perspective this failover is transparent. During the transition period, the client and server may experience a brief disruption and retransmissions.

    Connection failover can be enabled per RNAT rule. For enabling connection failover on an RNAT rule, you enable the connFailover (Connection Failover) parameter of that specific RNAT rule by using either NetScaler command line or configuration utility. Also, you must disable the tcpproxy (TCP Proxy) parameter globally for all RNAT rules in order for connection failover to work properly for TCP connections.

    For more information, see

    [From Build 47.14] [#457167]

  • Dynamic Routing support for Link-Local Subnet IPv6 addresses

    NetScaler appliances now support dynamic routing on a link-local Subnet IPv6 (SNIP6) address for a VLAN. In a default admin partition, link-local SNIP6 address takes precedence over the link-local NSIP6 address for running dynamic routing on a VLAN. In a non-default partition, the NetScaler appliance does not support dynamic routing on link-local NSIP6 address for a VLAN. Link-local SNIP6 address can now be used for running dynamic routing on the VLAN.

    [From Build 47.14] [#553544]

  • Configuring Allowed VLAN List

    NetScaler accepts and sends tagged packets of a VLAN on an interface if the VLAN is explicitly configured on the NetScaler appliance and the interface is bound to the VLAN. Some deployments (for example, Bump in the wire) require the NetScaler appliance to function as a transparent device to accept and forward tagged packets related to a large number of VLANs. For this requirement, configuring and managing a large number of VLANs is not a feasible solution.

    Allowed VLAN list on an interface specifies a list of VLANs. The interface transparently accepts and sends tagged packets related to the specified VLANs without the need for explicitly configuring these VLANs on the appliance. For more information, see

    [From Build 47.14] [#495219]

  • Using a Source Port from a Specified Port Range for Backend Communication

    By default, for configurations with USIP option disabled or with USIP and use proxy port options enabled, the NetScaler appliance communicates to the servers from a random source port (greater than 1024).

    The NetScaler supports using a source port from a specified port range for communicating to the servers. One of the use case of this feature is for servers that are configured to identify received traffic belonging to a specific set on the basis of source port for logging and monitoring purposes. For example, identifying internal and external traffic for logging purpose. For more information,

    [From Build 47.14] [#420067, 420039]

  • Managing High Availability Heartbeat Messages on a NetScaler Appliance

    The two nodes in a high availability configuration send and receive heartbeat messages to and from each other on all interfaces that are enabled. The heartbeat messages flow regardless of the HA MON setting on these interfaces. If NSVLAN or SYNCVLAN or both are configured on an appliance, the heartbeat messages flow only through the enabled interfaces that are part of the NSVLAN and SYNCVLAN.

    If a node does not receive the heartbeat messages on an enabled interface, it sends critical alerts to the specified Command Center and SNMP managers. These critical alerts give false alarms and draw unnecessary attention from the administrators for interfaces that are not configured as part of the connections to the peer node.

    To resolve this issue, the HAHeartBeat option for interfaces and channels is used for enabling or disabling HA heartbeat-message flow on them.

    For more information, see

    [From Build 47.14] [#477162, 575447, 604578]


  • Support for New Hardware Platforms

    The T1120 and T1300-40G platforms with NIC firmware 4.53 are now supported in this release.

    Note: T1300-40G platform with NIC firmware 4.26 has backward compatibility.

    [From Build 41.26, 47.14] [#593888]

  • Amazon Web Service IAM Roles Support

    NetScaler VPX on AWS cloud now supports IAM roles. IAM roles are designed for AWS applications to securely make API requests from their instances, without requiring users to manage the security credentials that the applications use. The user can define which accounts or AWS services can assume the roles. The application is granted the permissions for the actions and resources that the user has defined for the role through the security credentials associated with the role. An application on the instance retrieves the security credentials provided by the role from instance metadata item iam/security-credentials/role-name. These security credentials are temporary and are renewed automatically. New credentials are available at least five minutes before the expiration of the old credentials.

    [From Build 47.14] [#585172]

  • Support for VMXNET3 interfaces on NetScaler VPX Appliance in VMware ESX

    You can now configure NetScaler VPX appliance deployed on VMware ESX 6.0 or ESX 5.5 to use VMXNET3 network interfaces. The NetScaler VPX appliance now supports Intel 82599 10g Network Interface Card (NIC).

    For performance information of VMXNET3 interface on ESX, refer the latest VPX datasheet.

    For information on how to configure VMXNET3 interfaces on NetScaler VPX appliance, see

    [From Build 47.14] [#637336]

  • Support for SR-IOV interfaces on NetScaler VPX Appliance in VMware ESX

    You can now configure NetScaler VPX appliance deployed on VMware ESX 6.0 or ESX 5.5 to use SR-IOV network interfaces. The NetScaler VPX appliance now supports Intel 82599 10g Network Interface Card (NIC).

    For performance information of SR-IOV interface on ESX, refer the latest VPX datasheet.

    For information on how to configure SR-IOV interfaces on NetScaler VPX Appliance, see

    [From Build 47.14] [#637341]

  • Support for SR-IOV interfaces on NetScaler VPX Appliance in Linux-KVM

    You can now configure NetScaler VPX appliance deployed on Linux-KVM to use SR-IOV network interfaces.

    For performance information of SR-IOV interface on KVM, refer the latest VPX datasheet.

    For information on how to configure SR-IOV interfaces on NetScaler VPX Appliance in Linux-KVM, see

    [From Build 47.14] [#647418]


  • ECDSA Cipher Suites support on MPX appliances with N3 chips

    The NetScaler MPX appliances with N3 chips now support the elliptical curve digital signature algorithm (ECDSA) cipher group. The ECDHE_ECDSA key exchange mechanism provides forward secrecy. In ECDHE_ECDSA, the server's certificate must contain an ECDSA-capable public key. For client authentication, an ECDSA CA certificate must be bound to the virtual server.

    ECDSA cipher suites use elliptical curve cryptography (ECC). Because of its smaller size, it is particularly helpful in environments where processing power, storage space, bandwidth, and power consumption are constrained.

    Note: if you add an ECDSA certificate-key pair, only the following curves are supported:



    [From Build 41.26, 47.14] [#519632]

  • Support for ECDHE Ciphers on the back end on the NetScaler MPX 9700/10500/12500/15500 FIPS appliances.

    Citrix NetScaler MPX 9700/10500/12500/15500 FIPS appliances running firmware version 2.2 now support the ECDHE cipher group on the back end. This group contains the following ciphers:



    - TLS1_TXT_ECDHE_RSA_WITH_AES_128_SHA256 0xc027


    Because of its smaller key size, Elliptic Curve Cryptography (ECC) is especially useful in a mobile (wireless) environment and in an interactive voice response environment, where every millisecond is important. Smaller key sizes result in power, memory, bandwidth, and computational cost savings.

    The following ECC curves are supported: P_256, P_384, P_224, and P_521.

    By default, all four curves are bound to an SSL virtual server.

    [From Build 41.26, 47.14] [#543536]

  • Support for SNI on the Back-End Service

    The NetScaler appliance now supports Server Name Indication (SNI) at the back end. That is, the common name is sent as the server name in the client hello to the back-end server for successful completion of the handshake. In addition to helping meet federal system integrator customer security requirements, this enhancement provides the advantage of using only one port instead of opening hundreds of different IP addresses and ports on a firewall.

    Federal system integrator customer security requirements include support for Active Directory Federation Services (ADFS) 3.0 in 2012R2 and WAP servers. This requires supporting SNI at the back end on a NetScaler appliance.

    [From Build 41.26, 47.14] [#471431, 559271, 595785]

  • The NetScaler VPX appliance now supports AES-GCM/SHA2 ciphers on the front end.

    [From Build 41.26, 47.14] [#498207]

  • New Counters at the SSL Virtual Server Level and at the Global Level

    Six counters have been added to the output of the "stat ssl vserver" command, as follows:

    1. ssl_ctx_tot_enc_bytes: Tracks the number of encrypted bytes.

    2. ssl_ctx_tot_dec_bytes: Tracks the number of decrypted bytes.

    3. ssl_ctx_tot_hw_enc_bytes: Tracks the number of hardware encrypted bytes.

    4. ssl_ctx_tot_hw_dec_bytes: Tracks the number of hardware decrypted bytes.

    5. ssl_ctx_tot_session_new: Tracks the number of new sessions created.

    6. ssl_ctx_tot_session_hits: Tracks the number of session hits.

    Five counters have been added to the output of the "stat ssl -detail" command, as follows:

    1. ssl_tot_sslServerInRecords: Tracks the number of SSL records processed by the appliance.

    2. ssl_cur_sslInfo_SPCBInUseCount: Tracks the number of SSL protocol control blocks (SPCBs) used at any given point.

    2. ssl_cur_session_inuse: Tracks the number of active SSL sessions.

    4. ssl_cur_sslInfo_cardinBlkQ: Tracks the number of bulk encryption and decryption operations that are pending for card.

    5. ssl_cur_sslInfo_cardinKeyQ: Tracks the number of handshake-related operations that are pending for card.

    [From Build 47.14] [#597279, 582601]

  • Removing RC4-MD5 cipher from the default cipher list

    The RC4-MD5 cipher is removed from the list of default ciphers that are supported on a NetScaler appliance.

    For the updated list of ciphers supported by the NetScaler appliance, see

    [From Build 47.14] [#258311]

  • Support for ECC curves in Service Groups

    You can now bind ECC curves to back-end service groups by using the NetScaler command line.

    At the command prompt, type:

    bind ssl serviceGroup <serviceGroupName> -eccCurveName <eccCurveName>

    [From Build 47.14] [#592418]

  • Support for AES-GCM/SHA2 ciphers on the back-end of MPX appliances

    The NetScaler MPX appliance now supports AES-GCM/SHA2 ciphers on the back end.

    For the updated cipher/protocol support matrix, see

    [From Build 47.14] [#611979]

  • Support to create a Certificate Signing Request signed with the SHA256 Digest Algorithm

    The NetScaler appliance supports creating a CSR signed with the SHA256 digest algorithm. The encryption hash algorithm used in SHA256 makes it stronger than SHA1.

    For more information about creating a CSR signed with the SHA256 digest algorithm, see

    [From Build 47.14] [#606874, 595902]

  • Segregation of Certificates According to Type

    To facilitate certificate selection, certificates are now segregated according to type, such as server certificate, client certificate, and CA certificate.

    To view the certificates in the GUI, navigate to Traffic Management > SSL > Certificates.

    To view the certificates in the CLI, type "show ssl certkey"

    [From Build 47.14] [#620923, 623890]

  • Support for SafeNet Network HSM

    All NetScaler MPX, SDX, and VPX appliances except the MPX 9700/10500/12500/15500 FIPS appliances now support the SafeNet network hardware security module (HSM). A NetScaler ADC used with a SafeNet Network HSM provides FIPS 140-2 Level 2 and FIPS 140-2 Level 3 protection, depending on which SafeNet HSM is being used.

    SafeNet HSM integration with the ADC is supported for TLS versions 1.0, 1.1, and 1.2.

    For more information about configuring SafeNet network HSM, see

    [From Build 47.14] [#450699]


  • The "start nstrace" command has a new parameter, -capsslkeys, with which you can capture the SSL master keys for all SSL sessions. If the capsslkeys option is enabled, a file named nstrace.sslkeys is generated along with the packet trace and imported into Wireshark to decrypt the SSL traffic in the trace file.

    [From Build 41.26, 47.14] [#603225]

  • TCP Fast Open (TFO) is a TCP mechanism that enables speedy and safe data exchange between a client and a server during TCP's initial handshake. This feature is available as a TCP option in the TCP profile bound to a virtual server of a NetScaler appliance. TFO uses a TCP Fast Open Cookie (a security cookie) that the NetScaler appliance generates to validate and authenticate the client initiating a TFO connection to the virtual server. By using the TFO mechanism, you can reduce an application's network latency and the delay experienced in short TCP transfers.

    [From Build 41.26, 47.14] [#358990]

  • A new slow-start algorithm, Hybrid Start (Hystart) is configured as a TCP option in the relevant TCP profile bound to a virtual server. This algorithm dynamically determines a safe point at which to terminate (ssthresh) and enables a transition to avoid congestion with heavy packet losses. This option is disabled by default.

    [From Build 41.26, 47.14] [#603099]

  • Proactive Support for Hardware Errors

    The Citrix Call Home service automatically generates a support case and uploads the system data to the Technical Support server if a critical hardware error, such as failure of a hard disk drive (HDD), Compact Flash (CF) device, SSL card, or power supply unit (PSU), occurs in a NetScaler appliance on which the Call Home feature is enabled.

    [From Build 47.14] [#639336, 599891]

  • Dynamic TCP Buffer Management

    When you enable the Dynamic Receive Buffer option in a TCP profile, the NetScaler appliance can dynamically adjust the TCP receive buffer size for optimized memory usage based on the congestion window.

    [From Build 47.14] [#628115]

  • Bridge Group Support for Cluster

    Bridge Group functionality is now supported on a Layer 3 NetScaler cluster.

    [From Build 47.14] [#587548]

  • Warning about an Unsaved NetScaler Configuration

    The NetScaler GUI displays a Save icon with a red dot when a running configuration is not saved. A unsaved configuration could be lost if a power outage or restart occurs.

    To save the configuration(s), you can click the Save icon and then click Yes at the configuration prompt. When you return to the main screen by clicking OK, the icon is white.

    Note: In some cases, the red dot might appear even though there is no unsaved configuration. In that case, if you click the Save icon, the following message appears: "The running configuration has not changed."

    [From Build 47.14] [#626225]

  • Configuring SNMP Audit Log Levels

    After you enable the SNMP trap logging option, a NetScaler appliance on which at least one trap listener is configured can log SNMP trap messages (for SNMP alarms in which logging capability is enabled). Now, you can specify the audit log level of trap messages sent to an external log server. The default log level is Informational. Possible values are Emergency, Alert, Critical, Error, Warning, Debug, and Notice.

    For example, you can set the audit log level to Critical for an SNMP trap message generated by a logon failure. That information is then available on the NSLOG or SYSLOG server for troubleshooting.

    [From Build 47.14] [#569317]

  • You can now enable auto-bootstrapping on a NetScaler VPX or NetScaler 1000v instance running on Hyper-V, by attaching a DVD ROM with an appropriate ISO file to the instance before booting it up.

    [From Build 47.14] [#578451]

  • Proportional Rate Recovery Algorithm

    The Proportional Rate Recovery (PRR) algorithm is a fast recovery algorithm that evaluates TCP data during a loss recovery. It is patterned after Rate-Halving, by using the fraction that is appropriate for the target window chosen by the congestion control algorithm. It minimizes window adjustment, so that the actual window size at the end of recovery is close to the Slow-Start threshold (ssthresh).

    [From Build 47.14] [#473777]

  • RDX Error Management

    In the NetScaler GUI, if you skip a mandatory field or make an invalid entry, an error message appears beside the field or in the page header, depending on the type of error, and remains until you enter a valid value. For example, on the Add Virtual Server page, if you enter an invalid server IP address or port number, an error message appears beside the IP Address or Port field, and you cannot submit the page until you correct the error.

    [From Build 47.14] [#552575]

  • MAC Address is tied to the IP Address in case of an IP Conflict

    An SNMP trap that is sent as a result of an IP address conflict now contains the MAC address of the device. You can therefore identify the device by its MAC address. Previously, identifying the device was not possible, because the conflict lasts for only a short time.

    [From Build 47.14] [#570372, 524621]


  • Compact Logging for Large Scale NAT

    Logging LSN information is one of the important functions needed by ISPs to meet legal requirements and be able to identify the source of traffic at any given time. This eventually results in a huge volume of log data, requiring the ISPs to make large investments to maintain the logging infrastructure.

    Compact logging is a technique for reducing the log size by using a notational change involving short codes for event and protocol names. For example, C for client, SC for session created, and T for TCP. Compact logging results in an average of 40 percent reduction in log size.

    Compact logging is supported for NAT44, DS-Lite, and NAT64.

    [From Build 41.26, 47.14] [#496812]

  • Large Scale NAT64

    Because of the imminent exhaustion of IPv4 addresses, ISPs have started transitioning to IPv6 infrastructure. But during the transition, ISPs must continue to support IPv4 along with IPv6, because most of the public Internet still uses IPv4. Large scale NAT64 is an IPv6 transition solution for ISPs with IPv6 infrastructure to connect their IPv6-only subscribers to the IPv4 Internet. DNS64 is a solution for enabling discovery of IPv4-only domains by IPv6-only clients. DNS64 is used with large scale NAT64 to enable seamless communication between IPv6-only clients and IPv4-only servers.

    A NetScaler appliance implements large scale NAT64 and DNS64 and is compliant with RFCs 6145, 6146, 6147, 6052, 3022, 2373, 2765, and 2464.

    The following lists some of the large scale NAT64 features supported on NetScaler appliance:

    - ALGs. Support of application Layer Gateway (ALG) for SIP, RTSP, FTP, ICMP, and TFTP protocols.

    - Deterministic/Fixed NAT. Support for pre-allocation of blocks of ports to subscribers to minimize logging.

    - Mapping. Support of Endpoint-independent mapping (EIM), Address-dependent mapping (ADM), and Address-Port dependent mapping (APDM).

    - Filtering. Support of Endpoint-Independent Filtering (EIF), Address-Dependent Filtering (ADF), and Address-Port-Dependent Filtering (APDF).

    - Quotas. Configurable limits on number of ports, sessions per subscriber, and sessions per LSN group.

    - Static Mapping. Support for manually defining a large scale NAT64 mapping.

    - Hairpin Flow. Support for communication between subscribers or internal hosts using NAT IP addresses.

    - 464XLAT connections. Support for communication between IPv4-only aware applications on IPv6 subscriber hosts and IPv4 hosts on the Internet through IPv6 network.

    - Variable length NAT64 and DNS64 prefixes. The NetScaler appliance supports defining NAT64 and DNS64 prefixes of lengths of 32, 40, 48, 56, 64, and 96.

    - Multiple NAT64 and DNS64 prefix. The NetScaler appliance supports multiple NAT64 and DNS64 prefixes.

    - LSN Clients. Support for specifying or identifying subscribers for large scale NAT64 by using IPv6 prefixes and extended ACL6 rules.

    - Logging. Support for logging NAT64 sessions for law enforcement. In addition, the following are also supported for logging.

    -- Reliable SYSLOG. Support for sending SYSLOG messages over TCP to external log servers for a more reliable transport mechanism.

    -- Load balancing of log servers. Support for load balancing of external log servers for preventing storage of redundant log messages.

    -- Minimal Logging. Deterministic LSN configurations or Dynamic LSN configurations with port block significantly reduce the large scale NAT64 log volume.

    -- Logging MSISDN information. Support for including subscribers' MSISDN information in large scale NAT64 logs to identify and track subscriber activity over the Internet.

    [From Build 41.26, 47.14] [#496866]

  • Subscriber Aware LSN Session Termination

    Currently, if a subscriber session is deleted when a RADIUS Accounting STOP or a PCRF-RAR message is received, or as a result of any other event, such as TTL expiry or flush, the corresponding LSN sessions of the subscriber are removed only after the configured LSN timeout period. LSN sessions that are kept open until this timeout expires continue to consume resources on the appliance.

    This enhancement adds a new parameter (subscrSessionRemoval). If this parameter is enabled, and the subscriber information is deleted from the subscriber database, LSN sessions corresponding to that subscriber are also removed. If this parameter is disabled, the subscriber sessions are timed out as specified by the LSN timeout settings.

    [From Build 41.26, 47.14] [#578275]

  • NAT44 Wildcards Static Maps

    A static mapping entry is usually a one-to-one LSN mapping between a subscriber IP address:port and a NAT IP address:port. A one-to-one static LSN mapping entry exposes only one port of the subscriber to the Internet.

    Some situations might require exposing all ports (64K) of a subscriber to the Internet (for example, a server hosted on an internal network and running a different service on each port). To make these internal services accessible through the Internet, you have to expose all the ports of the server to the Internet.

    One way to meet this requirement is to add 64K one-to-one static mapping entries, one mapping entry for each port. Creating 64K entries is very cumbersome and a big task. Also, this large number of configuration entries might lead to performance issues in the NetScaler appliance.

    Another simple method is to use wildcard ports in a static mapping entry. You just need to create one static mapping entry with NAT-port and subscriber-port parameters set to the wildcard character (*), and the protocol parameter set to ALL, to expose all the ports of a subscriber to the Internet. For a subscriber's inbound or outbound connections matching a wildcard static mapping entry, the subscriber's port does not change after the NAT operation.

    [From Build 41.26, 47.14] [#614784]

  • Port Control Protocol for Large Scale NAT

    NetScaler appliances now support Port Control Protocol (PCP) for large scale NAT (LSN). Many of an ISP's subscriber applications must be accessible from Internet (for example, Internet of Things (IOT) devices, such as an IP camera that provides surveillance over the Internet). One way to meet this requirement is to create static large scale NAT (LSN) maps. But for a very large number of subscribers, creating static LSN NAT maps is not a feasible solution.

    Port Control Protocol (PCP) enables a subscriber to request specific LSN NAT mappings for itself and/or for other 3rd party devices. The large scale NAT device creates an LSN map and sends it to the subscriber. The subscriber sends the remote devices on the Internet the NAT IP address:NAT port at which they can connect to the subscriber.

    Applications usually send frequent keep-alive messages to the large scale NAT device so that their LSN mappings do not time out. PCP helps reduce the frequency of such keep-alive messages by enabling the applications to learn the timeout settings of the LSN mappings. This helps reduce bandwidth consumption on the ISP's access network and battery consumption on mobile devices.

    PCP is a client-server model and runs over the UDP transport protocol. A NetScaler appliance implements the PCP server component and is compliant with RFC 6887. Port Control Protocol is supported for NAT44, DS-Lite and NAT64 on the NetScaler appliance.

    [From Build 41.26, 47.14] [#496807]

  • Global override LSN parameter removed from L3 parameters

    The global override LSN parameter has been removed from L3 parameters. To override LSN, you must now create a net profile with the overrideLsn parameter enabled and bind this profile to all the load balancing virtual servers that are configured for value added services. For more information, see

    [From Build 47.14] [#642585]

  • Policy-based TCP Profile

    You can now configure the NetScaler appliance to perform TCP optimization based on subscriber attributes. For example, the appliance can now select different TCP profiles at run time, based on the network to which the user equipment (UE) is connected. As a result, you can improve a mobile user's experience by setting some parameters in the TCP profiles and then using policies to select the appropriate profile.

    For more information about policy-based TCP profile, see

    [From Build 47.14] [#622947]

  • HTTP Header Logging Support for DS-Lite

    The NetScaler appliance can now log request header information of an HTTP connection that is using the NetScaler's DS-Lite functionality. The HTTP header logs can be used by ISPs to see the trends related to the HTTP protocol among a set of subscribers. For example, an ISP can use this feature to find out the most popular website among a set of subscribers. For more information, see

    [From Build 47.14] [#558159, 559227]

  • Support for SIP and RTSP ALGs for DS-Lite

    The NetScaler appliance now supports SIP and RTSP application layer gateways (ALGs) for DS-Lite. For more information, see:



    [From Build 47.14] [#604029]