Secure communications

To secure the communication between your site and Citrix Workspace app, you can integrate your Citrix Workspace app connections using secure technologies such as Citrix Gateway.


Citrix recommends using Citrix Gateway between StoreFront servers and user devices.

  • A firewall: Network firewalls can allow or block packets based on the destination address and port. If you’re using Citrix Workspace app through a network firewall that maps the server’s internal network IP address to an external Internet address (that is, network address translation, or NAT), configure the external address.

  • Trusted server.

  • For Citrix Virtual Apps and Desktops or Citrix DaaS (formerly Citrix Virtual Apps and Desktops service) deployments only (not applicable to XenDesktop 7): A SOCKS proxy server or secure proxy server (also known as security proxy server, HTTPS proxy server, or Transport Layer Security (TLS) tunneling proxy server). You can use proxy servers to limit access to and from your network and to handle connections between Citrix Workspace app and servers. Citrix Workspace app supports SOCKS and secure proxy protocols.

  • For Citrix Virtual Apps and Desktops or Citrix DaaS deployments only: Citrix Secure Web Gateway or SSL Relay solutions with TLS protocols. TLS versions 1.0 through 1.2 are supported.

Citrix Gateway

Citrix Gateway (formerly Access Gateway) secures connections to StoreFront stores. Also, lets administrators control, in a detailed way, user access to desktops and applications.

To connect to desktops and applications through Citrix Gateway:

  1. Specify the Citrix Gateway URL that your administrator provides using one of the following ways:

    • The first time you use the self-service user interface, you are prompted to enter the URL in the Add Account dialog box
    • When you later use the self-service user interface, enter the URL by clicking Preferences > Accounts > Add
    • If you’re establishing a connection with the storebrowse command, enter the URL at the command line

    The URL specifies the gateway and, optionally, a specific store:

    • To connect to the first store that Citrix Workspace app finds, use a URL of the form, for example:
    • To connect to a specific store, use a URL of the form, for example:<storename>. This dynamic URL is in a non-standard form; do not include = (the equals sign character) in the URL. If you’re establishing a connection to a specific store with storebrowse, you might need quotation marks around the URL in the storebrowse command.
  2. When prompted, connect to the store (through the gateway) using your user name, password, and security token. For more information on this step, see the Citrix Gateway documentation.

    When authentication is complete, your desktops and applications are displayed.

Proxy server

Proxy servers are used to limit access to and from your network, and to handle connections between Citrix Workspace app and your Citrix Virtual Apps and Desktops or Citrix DaaS deployment.

Citrix Workspace app supports the SOCKS protocol, along with the following:

  • Citrix Secure Web Gateway and Citrix SSL Relay, the secure proxy protocol
  • Windows NT Challenge/Response (NTLM) authentication.

The list of supported proxy types is restricted in the Trusted_Regions.ini and Untrusted_Regions.ini to the Auto, None, and Pad types. If you use the SOCKS, Secure, or Script types, edit those files to add the additional types to the permitted list.


To ensure a secure connection, enable TLS.

Secure proxy server

Configuring connections to use the secure proxy protocol also enables support for Windows NT Challenge/Response (NTLM) authentication. If this protocol is available, it is detected and used at run time without any additional configuration.


NTLM support requires the OpenSSL 1.1.1d and libraries. Install the libraries on the user device. These libraries are often included in Linux distributions. You can also download them from

Secure Web Gateway and SSL

You can integrate Citrix Workspace app with the Citrix Secure Web Gateway or Secure Sockets Layer (SSL) Relay service. Citrix Workspace app supports the TLS protocol. TLS (Transport Layer Security) is the latest, standardized version of the SSL protocol. The Internet Engineering Taskforce (IETF) renamed it TLS when it took over responsibility for the development of SSL as an open standard. TLS secures data communications by providing server authentication, encryption of the data stream, and message integrity checks. Some organizations, including U.S. government organizations, require the use of TLS to secure data communications. These organizations might also require the use of validated cryptography, such as FIPS 140 (Federal Information Processing Standard). FIPS 140 is a standard for cryptography.

Secure Web Gateway

You can use the Citrix Secure Web Gateway in Normal mode or Relay mode to provide a secure channel for communication between Citrix Workspace app and the server. No configuration of Citrix Workspace app is required if you’re using the Citrix Secure Web Gateway in Normal mode.

If the Citrix Secure Web Gateway Proxy is installed on a server in the secure network, you can use the Citrix Secure Web Gateway Proxy in Relay mode. For more information, see the Citrix Virtual Apps (Citrix Secure Web Gateway) documentation.

If you’re using Relay mode, the Citrix Secure Web Gateway server functions as a proxy and you must configure Citrix Workspace app to use:

  • The fully qualified domain name (FQDN) of the Citrix Secure Web Gateway server.
  • The port number of the Citrix Secure Web Gateway server. Citrix Secure Web Gateway Version 2.0 does not support Relay mode.

The FQDN must list, in sequence, the following three components:

  • Host name
  • Intermediate domain
  • Top-level domain

For example: is an FQDN, because it lists, in sequence, a host name (my_computer), an intermediate domain (my_company), and a top-level domain (com). The combination of intermediate and top-level domain ( is referred to as the domain name.

SSL Relay

By default, Citrix SSL Relay uses TCP port 443 on the Citrix Virtual Apps and Desktops or Citrix DaaS server for TLS-secured communication. When the SSL Relay receives a TLS connection, it decrypts the data before redirecting it to the server.

If you configure SSL Relay to listen on a port other than 443, you must specify the non-standard listening port number to Citrix Workspace app.

You can use Citrix SSL Relay to secure communications:

  • Between a TLS-enabled user device and a server

For information about configuring and using SSL Relay to secure your installation, see the Citrix Virtual Apps documentation.


Previously, the minimum TLS version supported was 1.0, and the maximum TLS version supported was 1.2. Starting with version 2203, the maximum TLS version supported is 1.3.

You can control the versions of the TLS protocol that can be negotiated by adding the following configuration options in the [WFClient] section:

  • MinimumTLS=1.1
  • MaximumTLS=1.3

These values are the default values, which are implemented in code. Adjust them as you require.


  • These values are read whenever programs start. If you change them after starting self-service or storebrowse, type: killall AuthManagerDaemon ServiceRecord selfservice storebrowse.

  • Citrix Workspace app for Linux does not allow the use of the SSLv3 protocol.

  • TLS 1.0/1.1 works only with the older VDI or Citrix Gateway which support them.

To select the cipher suite set, add the following configuration option in the [WFClient] section:

  • SSLCiphers=GOV

This value is the default value. Other recognized values are COM and ALL.


As with the TLS version configuration, if you change this configuration after starting self-service or storebrowse you must type: killall AuthManagerDaemon ServiceRecord selfservice storebrowse

CryptoKit update

CryptoKit Version 14.2 is integrated with the OpenSSL 1.1.1d version.

Cryptographic update

This feature is an important change to the secure communication protocol. Cipher suites with the prefix TLS_RSA_ do not offer forward secrecy and are considered weak.

The TLS_RSA_ cipher suites have been removed entirely. Instead, it supports the advanced TLS_ECDHE_RSA_ cipher suites.

If your environment isn’t configured with the TLS_ECDHE_RSA_ cipher suites, client launches aren’t supported because of weak ciphers. For client authentication, 1536-bit RSA keys are supported.

The following advanced cipher suites are supported:

  • TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)
  • TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)

DTLS v1.0 supports the following cipher suites:


DTLS v1.2 supports the following cipher suites:


TLS v1.3 supports the following cipher suites:

  • TLS_AES_128_GCM_SHA256 (0x1301)
  • TLS_AES_256_GCM_SHA384 (0x1302)


From version 1903 and later, DTLS is supported from Citrix Gateway 12.1 and later. For information on DTLS supported cipher suites for Citrix Gateway, see Support for DTLS protocol

Cipher suites

To enable different cipher suites, change the parameter SSLCiphers value to ALL, COM, or GOV. By default, the option is set to ALL in the All_Regions.ini file in the $ICAROOT/config directory.

The following sets of cipher suites are provided by ALL, GOV, and COM, respectively:

  • ALL
    • all 3 ciphers are supported.
  • GOV
    • TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)
    • TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)
  • COM
    • TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013)

For troubleshooting information, see Cipher suites.

Cipher suites with the prefix TLS_RSA_ do not offer forward secrecy. These cipher suites are now deprecated in the industry. However, to support backward compatibility with older versions of Citrix Virtual Apps and Desktops or Citrix DaaS, Citrix Workspace app includes an option to enable these cipher suites.

For better security, set the flag Enable\_TLS\_RSA\_ to False.

Following is the list of deprecated cipher suites:

  • TLS_RSA_WITH_RC4_128_MD5


The last two cipher suites use the RC4 algorithm and are deprecated because they are insecure. You might also consider the TLS_RSA_3DES_CBC_EDE_SHA cipher suite to be deprecated. You can use flags to enforce all these deprecations.

For information on configuring DTLS v1.2, see the Adaptive transport section in the Citrix Virtual Apps and Desktops documentation.


If you’re using version 1901 and earlier, do the following steps:

If .ICAClient is already present in the home directory of the current user:

  • Delete All\_Regions.ini file


  • To retain the AllRegions.ini file, add the following lines at the end of the [Network\SSL] section:
    • Enable_RC4-MD5=
    • Enable_RC4_128_SHA=
    • Enable_TLS_RSA_=

If the .ICAClient folder isn’t present in the home folder of the current user, it indicates a fresh install of the Citrix Workspace app. In that case, the default setting for the features is retained.

The following table lists the cipher suites in each set: Table 1 – Cipher suite support matrix

Image of a table that displays cipher suite support matrix


All the preceding cipher suites are FIPS- and SP800-52- compliant. The first two are allowed only for (D)TLS1.2 connections. See Table 1 – Cipher suite support matrix for a comprehensive representation of cipher suite supportability.

Secure communications