In this post I wanted to discuss the use of Citrix Enlighted Data Transport with Citrix Gateway Service. This is a feature that has been available with Citrix ADC for quite some time but it is a new feature for Gateway Service. I wanted to take you through step by step on how to configure EDT and Adaptive Transport with Gateway Service, as well as discuss any system requirements that are needed to get you up and running.
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What is Adaptive Transport
Okta and the Citrix Ready Workspace Security Program The Citrix Ready Workspace Security Program provides a choice of leading security vendors that complement Citrix solutions, allowing people to securely work anytime, from anywhere, while simplifying how IT manages the environment. The program showcases a partner ecosystem of trusted security. Citrix NetScaler Gateway can integrate with Okta as the Identify Provider (IdP) through SAML 2.0 and RADIUS. This article will outline how to configure both integrations, in order to enable SSO and Adaptive MFA on the NetScaler Gateway, using Okta. The Citrix clients will be configured as follows: Citrix Receiver for Web.
Adaptive transport is a proprietary transport protocol that functions well on highly latent networks, which TCP alone finds challenging. This protocol is adaptive and can switch to TCP or UDP based on network conditions in order to ensure the best user experience for users using HDX.
Enlighted Data Transport System requirements
- VDA 1912 or later
- Rendezvous protocol must be enabled and working ( We cover this next)
- Ports UDP 443 and TCP must be open outbound from VDA to the Internet
- Adaptive Transport must be enabled
- EDT is supported with all supported OS’s. Citrix do recommend the use of Windows 10 and Windows 2019 when running EDT with Citrix Gateway Service
- Latest Workspace App Version ( 1908 or above for Parallel connections)
Configuring Rendezvous Protocol
When you are configuring Rendezvous protocol for use with Citrix CVAD Service the following is required.
- VDA 1912 or later
- Enable the Rendezvous protocol in the Citrix policies in Studio
- The Cloud Connectors must obtain the VDA’s FQDN when brokering a session. This can be achieved by using the the following commands in Powershell:
- asnp citrix*
- Get- XDAuthentication
Set the DNS Resolution to True
Set-Brokersite -DNSResolutionEnabled $True
To check that the DNS Settings are configured correctly – Type Get-Brokersite
The DNS Resolution should now be set to True.
Citrix Policy Requirements
Now that the DNS settings are complete, we need to ensure the Citrix Policies are also set for Rendezvous protocol. (The Rendezvous protocol allows HDX sessions to bypass the Citrix Cloud Connector and connect directly and securely to the Citrix Gateway service.)
Please see more detail here: https://docs.citrix.com/en-us/citrix-virtual-apps-desktops-service/hdx/rendezvous-protocol.html
To set the Citrix policy, Open Citrix Studio and create a new policy for Rendezvous protocol.
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Okta Citrix Integration
Click enable , and also enable Adaptive transport.
Lets also set up Session Reliability setting, as our final policy requirement. Enabling Session Reliability will allow users to automatically reconnect to Citrix sessions after a disruption.
Now that Rendezvous protocol is setup, lets move on to complete the setup to allow for the use of EDT.
Open Microsoft Group Policy Manager, and create a policy that will allow for you to set the Cipher Suite for the VDA workloads. Choose Computer configuration, Network, SSL Configuration, SSL Cipher Suite Order.
Netscaler Okta Mfa
Lets now check if the settings are working as expected
Within the HDX session, launch a desktop and open powershell
The transport protocols used are displayed as below when successfully using EDT
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