TLS and Compliance Mode Configuration

Use this policy to configure the TLS options that ensure Citrix Receiver securely identifies the server that it is connecting to and to encrypt all communication with the server. Citrix recommends that connections over untrusted networks use TLS. Citrix supports TLS 1.0, TLS 1.1 and TLS 1.2 protocols between Receiver and XenApp or XenDesktop.

When this policy is enabled, you can force Receiver to use TLS for all connections to published applications and desktops by checking the "Require TLS for all connections" checkbox.

Security Compliance Mode sets the compliance mode for the TLS connection between Receiver and XenApp or XenDesktop. The compliance mode takes precedence over other settings. For example, when configured to SP800-52 only two Certificate Revocation Check Policy values are allowed; Full Access Check And CRL Required (default) or Full Access Check And CRL Required All (see below for a description). SP800-52 enforces FIPS mode and restricts the TLS cipher suite set. The Security Compliance Mode values are:

- None - No compliance mode is enforced
- FIPS - FIPS cryptographic modules are used
- SP800-52 - NIST SP800-52r1 compliance is enforced

Receiver identifies the server by the name on the security certificate that the server presents. This has the form of a DNS name, for example, www.citrix.com. You can restrict Receiver to connect only to particular servers specified by a comma separated list in the "Allowed TLS servers" setting. Wildcards and port numbers can be specified here, for example, *.citrix.com:4433 allows connection to any server whose common name ends with .citrix.com on port 4433. The accuracy of the information in a security certificate is asserted by the certificate's issuer. If Receiver does not recognize and trust a certificate's issuer, the connection is rejected.

The TLS version can be restricted to any combination of:

- TLS 1.0, TLS 1.1 or TLS 1.2
- TLS 1.1 or TLS 1.2
- TLS 1.2 only

The TLS cipher suite can be configured to one of the following:

- Any
- Commercial
- Government

When "Any" is set the policy is unconfigured and the following cipher suites are allowed:

- TLS_RSA_WITH_RC4_128_MD5
- TLS_RSA_WITH_RC4_128_SHA
- TLS_RSA_WITH_3DES_EDE_CBC_SHA
- TLS_RSA_WITH_AES_128_CBC_SHA
- TLS_RSA_WITH_AES_256_CBC_SHA
- TLS_RSA_WITH_AES_128_GCM_SHA256
- TLS_RSA_WITH_AES_256_GCM_SHA384

When "Commercial" is set only the following cipher suites are allowed:

- TLS_RSA_WITH_RC4_128_MD5
- TLS_RSA_WITH_RC4_128_SHA
- TLS_RSA_WITH_AES_128_CBC_SHA
- TLS_RSA_WITH_AES_128_GCM_SHA256

When "Government" is set only the following cipher suites are allowed:

- TLS_RSA_WITH_AES_256_CBC_SHA
- TLS_RSA_WITH_3DES_EDE_CBC_SHA
- TLS_RSA_WITH_AES_128_GCM_SHA256
- TLS_RSA_WITH_AES_256_GCM_SHA384

The Certificate Revocation Check Policy is used to improve the cryptographic authentication of the Citrix server and improves the overall security of the TLS connections between a client and a server.

When you enable this setting, the client checks whether or not the server's certificate is revoked. There are several levels of certificate revocation list checking. For example, the client can be configured to check only its local certificate list, or to check the local and network certificate lists. In addition, certificate checking can be configured to allow users to log on only if all Certificate Revocation lists are verified.

Certificate Revocation Check Policy is an advanced feature supported by some certificate issuers. It allows an administrator to revoke security certificates (invalidated before their expiry date) in the case of compromise of the certificate private key.

Applicable values for this setting include:

- NoCheck - No Certificate Revocation List check is performed.
- Check With No Network Access - Certificate revocation list check is performed. Only local certificate revocation list stores are used. All distribution points are ignored. Finding a Certificate Revocation List is not critical for verification of the server certificate presented by the target SSL Relay/Secure Gateway server.
- Full Access Check - Certificate Revocation List check is performed. Local Certificate Revocation List stores and all distribution points are used. If revocation information for a certificate is found, the connection will be rejected. Finding a Certificate Revocation List is not critical for verification of the server certificate presented by the target server.
- Full Access Check And CRL Required - Certificate Revocation List check is performed, excluding the root CA. Local Certificate Revocation List stores and all distribution points are used. If revocation information for a certificate is found, the connection will be rejected. Finding all required Certificate Revocation Lists is critical for verification.
- Full Access Check And CRL Required All - Certificate Revocation List check is performed, including the root CA. Local Certificate Revocation List stores and all distribution points are used. If revocation information for a certificate is found, the connection will be rejected. Finding all required Certificate Revocation Lists is critical for verification.

Organizations that configure TLS for a range of products can choose to identify servers intended for Citrix Receiver by specifying a Certificate Policy OID as part of the security certificate. If a Policy OID is configured here, Receiver accepts only certificates that declare a compatible Policy.

When connecting by TLS, the server may be configured to require Receiver to provide a security certificate identifying itself. Use the "Client Authentication" setting to configure whether or not identification is provided automatically or if the user is notified. Options include:

- Disabled - Client Authentication is disabled
- Display certificate selector - Always prompt the user to select a certificate
- Select automatically if possible - Prompt the user only if there a choice of certificate to supply
never supply identification
- Use specified certificate - Use the Client Certificate specified in the setting below

Use the "Client Certificate" setting to specify the identifying certificate's thumbprint to avoid prompting the user unnecessarily.

Supported on: All Receiver supported platforms
Require TLS for all connections
Registry HiveHKEY_CURRENT_USER
Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
Value NameSSLEnable
Value TypeREG_SZ
Default Valuetrue
True Valuetrue
False Value*
Security Compliance Mode


  1. NONE
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLSecurityComplianceMode
    Value TypeREG_SZ
    ValueNONE
  2. SP800-52
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLSecurityComplianceMode
    Value TypeREG_SZ
    ValueSP800-52

Enable FIPS
Registry HiveHKEY_CURRENT_USER
Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
Value NameSSLFIPSEnable
Value TypeREG_SZ
Default Value*
True Valuetrue
False Value*
TLS version


  1. TLS1.2
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSecureChannelProtocol
    Value TypeREG_SZ
    ValueTLS12
  2. TLS1.1 | TLS1.2
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSecureChannelProtocol
    Value TypeREG_SZ
    ValueTLS11_TLS12
  3. TLS1.0 | TLS1.1 | TLS1.2
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSecureChannelProtocol
    Value TypeREG_SZ
    ValueTLS11_TLS12_TLS13

TLS cipher suite


  1. Any
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLCiphers
    Value TypeREG_SZ
    Value
  2. Government
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLCiphers
    Value TypeREG_SZ
    ValueGOV
  3. Commercial
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLCiphers
    Value TypeREG_SZ
    ValueCOM

Certificate Revocation Check Policy


  1. NoCheck
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLCertificateRevocationCheckPolicy
    Value TypeREG_SZ
    ValueNoCheck
  2. Check with no network access
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLCertificateRevocationCheckPolicy
    Value TypeREG_SZ
    ValueCheckNoNetworkAccess
  3. Full Access Check
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLCertificateRevocationCheckPolicy
    Value TypeREG_SZ
    ValueFullAccessCheck
  4. Full access check and CRL required
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLCertificateRevocationCheckPolicy
    Value TypeREG_SZ
    ValueFullAccessCheckAndCrlRequired
  5. Full access check and CRL required All
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLCertificateRevocationCheckPolicy
    Value TypeREG_SZ
    ValueFullAccessCheckAndCrlRequiredAll

Client Authentication


  1. Not Configured
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLClientAuthentication
    Value TypeREG_SZ
    Value
  2. Display certificate selector
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLClientAuthentication
    Value TypeREG_SZ
    ValueAlwaysPromptUser
  3. Disabled
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLClientAuthentication
    Value TypeREG_SZ
    ValueOff
  4. Use specified certificate
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLClientAuthentication
    Value TypeREG_SZ
    ValueOn
  5. Select automatically if possible
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Network\SSL
    Value NameSSLClientAuthentication
    Value TypeREG_SZ
    ValuePromptUser


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