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CVAD 2402LTSR - Pure IPv6 Server Environment VDA Registration Fails No IP / Unknown IP


Tom Swift

Question

We've built a pure IPv6 environment all the way from the Domain Controller, Delivery Controller to APP server with no IPv4 at all.  The servers have never once connected to anything via IPv4.  In fact, even Windows Updates were run using only IPv6.  We are running in to an issue with the VDA not registering with the Delivery Controller.  Everything is on-prem.  The VDA machine is able to ping by resolving the FQDN by getting the IPv6 IP from the IPv6 DNS server running on our Windows 2019 Server domain controller, but we get the following errors in the event log:

Event log ID 1010 on VDA: The Citrix Desktop Service successfully obtained the following list of 1 delivery controller(s) with which to register: 'ctxctrl01.domain.local (<Unknown IP>)'.
Event log ID 1037 on VDA: No IP address could be found for the delivery controller http://ctxctrl01.domain.local:80/Citrix/CdsController/IRegistrar', Registration attempts will continue until registration succeeds.

 

This article indicates Citrix CVAD2402 will work in an ONLY IPv6 environment.  It mentions some global policy setting, but not where to set it.

https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/manage-deployment/ipv6.html

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The VDA still doesn't register with the controller.  On the controller we did a GPEDIT.MSC and set the Only use IPv6 Controller registration value to "Enabled".  For good measure, although probably not necessary we rebooted both the controller and VDA.  On the VDA we did a manual restart of the Citrix Desktop Service and are still seeing the same exact errors in the event logs:

 

Event log ID 1010 on VDA: The Citrix Desktop Service successfully obtained the following list of 1 delivery controller(s) with which to register: 'ctxctrl01.domain.local (<Unknown IP>)'.
Event log ID 1037 on VDA: No IP address could be found for the delivery controller http://ctxctrl01.domain.local:80/Citrix/CdsController/IRegistrar', Registration attempts will continue until registration succeeds.

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We managed to get it registered, but looking for a better way.  Using the 2402LTSR media we ran CitrixGroupPolicyManagement_x64.msi on the VDA, GPEDIT, modified the Unfiltered policy, searched for IPV6, enabled "Only use IPv6 Controller registration", restarted the Citrix Desktop Service and shortly after in the App event logs we had an event ID 1012 - Successfully registered with controller.  Instead of GPEDIT, there has to be a way to get the ADMX & ADML files to the SYSVOL of C:\Windows\PolicyDefinitions on a Domain Controller so we can use GPMC.MSC instead and apply it to devices in the Domain and not just individual machines.  Supposedly 2402LTSR supports PURE IPv6, but not without installing CitrixGroupPolicyManagement_x64.msi on the VDA.  Also kind of interesting that if "Only use IPv6 Controller registration" isn't enabled it'll only use IPv4.  I guess it's not smart enough just yet to determine if only IPv6 is running on a VDA and use it or first try IPv6 and then auto downgrade to IPv4 if IPv6 doesn't work.  Thank you.

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My team got some feedback from Citrix on how to have the Citrix policy pushed from a Domain Controller via GPO (Group Policy) to VDA's:

1.   Windows Domain Controller
2.   Mount Citrix 2402 Media ISO
3.   Install Microsoft Visual C++ x64 and x86 from D:\Support\vCRedist (If this isn't installed when editing Citrix policy MMC will crash)
      VC_redist.x64.exe
      VC_redist.x86.exe - Not 100% sure if this was required on a Windows 2019 server but did it just to be safe as VDA's have both auto-installed
4. Install Citrix Group Policy Management from D:\x64\Citrix Policy
      CitrixGroupPolicyManagement_x64.msi
5. GPMC.MSC - Edit or Create Policy, EDIT, Computer Configuration, Policies, Citrix, EDIT, Only use IPv6 Controller registration (Enabled)

 

 

CTX01.jpg

CTX02.jpg

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