Users Get A Gray Screen On Initiating ICA Session On Windows 10 v1511

Users Get A Gray Screen On Initiating ICA Session On Windows 10 v1511

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Article ID: CTX227855

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Description

Users Get A Gray Screen On Initiating ICA Session On Windows 10 v1511 Desktops Upgraded from XenDesktop 7.11 to 7.13 via cmd line.

The issue does not get resolved on rebooted the Win 10 VDA.

Environment

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Resolution

  • After upgrading Windows 10 v1511 from 7.11 to 7.13, the grey screen issue gets resolved after replacing ctxuvis.sys with the correct 7.13 version. 
  • The grey screen issue  does not occur With Windows 10 1607 or 1703 while upgrading Win 10 VDA from XenDesktop 7.11 to 7.14.1.
  • Issue is not seen with fresh installation of XenDesktop 7.13 on Win 10 v1511.
ADDITIONAL INFORMATION
 
  • Citrix advises not to apply the Anniversary Update (v1607) on existing Windows 10 machines with Citrix VDA for Windows Desktop OS installed. Citrix recommends uninstalling the VDA for Windows Desktop, applying the Anniversary Update (v1607) and then reinstalling Citrix VDA for Windows Desktop.

Problem Cause

The issue is specific to Win 10 1511.
At times during Win 10 1511 upgrade from VDA 7.11 to 7.13, ctxuvi.sys was not getting updated which resulted in hash verification failure for MfAphook64.dll. The below error was seen in CDF logs during Upgrade.
 
The CtxUvi Driver has encountered an unexpected error.' Code: 0xC0FF03ED Status: 0xC0000428 Reason: 'INTRNCHK'
UviCompareSectionsHashWithPredefinedHashes: file 'C:\Program Files\Citrix\System32\MfApHook64.dll' hash failed verification with allowed hash(es) - no match found
UviCompareSectionsHashWithPredefinedHashes: Failed for file: 'C:\Program Files\Citrix\System32\MfApHook64.dll' with status: 0xC0000428
UviInternalVerifyInjectionDllsHashes: Verify InjectionDlls Hashes: VERIFICATION FAILURE - IsWow64: 0000    
'The CtxUvi Driver has detected an integrity error during initialization. The CtxUvi Driver has been disabled
 

Issue/Introduction

Users Get A Gray Screen On Initiating ICA Session On Windows 10 v1511 Desktops Upgraded from Xendesktop 7.11 to 7.13

Additional Information

Troubleshooting Gray or Black Screen

 
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