MCS Clones Use Incorrect Time Synchronization Source After Updating to CVAD 2507 CU1

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Article ID: CTX696531

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Updated On:

Description

After upgrading CVAD to 2507 CU1, MCS provisioned VDAs may incorrectly switch their Windows Time Service configuration from NT5DS  to NTP

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\Type is overwritten with NTP instead of the expected NT5DS for domain‑joined machines.

As a result the VDA cannot registers successfully

Issue only affects MCS clones

 

 

Environment

Caution! Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.

Cause

CVAD 2507 CU1 with  MCS‑provisioned machines may be configured with the wrong Windows Time Service settings during creation.

Resolution

A fix is scheduled in future release

Workaround:

Until the permanent fix is applied, enforcing the correct time synchronization mode using one of the following methods:

1.Apply GPO to enforce NT5DS

Configure a Group Policy Object targeting VDA machines: Registry Path: HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Parameters Value: Type = NT5DS

2.Scheduled Task on the Master Image

Create a startup scheduled task on the master image to force the correct time configuration after cloning.

Powershell:

$action = New-ScheduledTaskAction -Execute "cmd.exe" -Argument '/c w32tm /config /syncfromflags:DOMHIER /reliable:YES /update && net stop w32time && net start w32time'
$trigger = New-ScheduledTaskTrigger -AtStartup
$principal = New-ScheduledTaskPrincipal -UserId "SYSTEM" -LogonType ServiceAccount -RunLevel Highest

Register-ScheduledTask -TaskName "SyncTimePostBoot" -Action $action -Trigger $trigger -Principal $principal

This forces the VDA to reapply DOMHIER/NT5DS time sync mode immediately after boot.

 

Issue/Introduction

  • Domain‑joined master image is configured correctly, but clones revert to incorrect time sync mode.
  • MCSprovisioned VDAs inherit NTP configuration instead of NT5DS after image update.
  • Issue does not occur on CVAD 2402