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Authentication and Authorization
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Configuring the VPN User Experience
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How User Connections Work with the NetScaler Gateway Plug-in
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Integrating the NetScaler Gateway Plug-in with Citrix Receiver
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Maintaining and Monitoring the System
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Deploying with XenMobile App Edition, XenApp, and XenDesktop
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Accessing XenApp and XenDesktop Resources with the Web Interface
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Establishing a Secure Connection to the Server Farm
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Configuring Additional Web Interface Settings on NetScaler Gateway
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Configuring Access to Applications and Virtual Desktops in the Web Interface
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Configuring Settings for Your XenMobile Environment
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Configuring Load Balancing Servers for Microsoft Exchange with Email Security Filtering
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Configuring XenMobile NetScaler Connector (XNC) ActiveSync Filtering
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Configuring Domain and Security Token Authentication for XenMobile
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Configuring Client Certificate or Client Certificate and Domain Authentication
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Establishing a Secure Connection to the Server Farm
The following example shows how NetScaler Gateway deployed in the DMZ works with the Web Interface to provide a secure, single point-of-access to published resources available in a secure enterprise network.
In this example, all of the following conditions exist:
- User devices from the Internet connect to NetScaler Gateway by using Citrix Receiver.
- The Web Interface resides behind NetScaler Gateway in the secure network. The user device makes the initial connection to NetScaler Gateway and the connection is passed to the Web Interface.
- The secure network contains a server farm. One server within this server farm runs the Secure Ticket Authority (STA) and the Citrix XML Service. The STA and the XML Service can run on either XenApp or XenDesktop.
Process Overview: User Access to Published Resources in the Server Farm
- A remote user types the address of NetScaler Gateway; for example,
https://www.ag.wxyco.com
, in the address field of a web browser. The user device attempts this SSL connection on port 443, which must be open through the firewall for the connection to succeed. - NetScaler Gateway receives the connection request and users are asked for their credentials. The credentials are passed back through NetScaler Gateway, users are authenticated, and the connection is passed to the Web Interface.
- The Web Interface sends the user credentials to the Citrix XML Service running in the server farm.
- The XML Service authenticates the user credentials and sends the Web Interface a list of the published applications or desktops the user is authorized to access.
- The Web Interface populates a Web page with the list of published resources (applications or desktops) that the user is authorized to access and sends this Web page to the user device.
- The user clicks a published application or desktop link. An HTTP request is sent to the Web Interface indicating the published resource that the user clicked.
- The Web Interface interacts with the XML Service and receives a ticket indicating the server on which the published resource runs.
- The Web Interface sends a session ticket request to the STA. This request specifies the IP address of the server on which the published resource runs. The STA saves this IP address and sends the requested session ticket to the Web Interface.
- The Web Interface generates an ICA file containing the ticket issued by the STA and sends it to the Web browser on the user device. The ICA file generated by the Web Interface contains the fully qualified domain name (FQDN) or the Domain Name System (DNS) name of NetScaler Gateway. Note that the IP address of the server running the requested resource is never revealed to users.
- The ICA file contains data instructing the web browser to start Citrix Receiver. The user device connects to NetScaler Gateway by using the NetScaler Gateway FQDN or DNS name in the ICA file. Initial SSL/TLS handshaking occurs to establish the identity of NetScaler Gateway.
- The user device sends the session ticket to NetScaler Gateway and then NetScaler Gateway contacts the STA for ticket validation.
- The STA returns the IP address of the server on which the requested application resides to NetScaler Gateway.
- NetScaler Gateway establishes a TCP connection to the server.
- NetScaler Gateway completes the connection handshake with the user device and indicates to the user device that the connection is established with the server. All further traffic between the user device and the server is proxied through NetScaler Gateway. The traffic between the user device and NetScaler Gateway is encrypted. The traffic between NetScaler Gateway and the server can be encrypted independently, but is not encrypted by default.
Establishing a Secure Connection to the Server Farm
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