BSOD – Citrix XenApp 6.5 – vdtw30.dll

Got the following Blue Screen of Death (BSOD) on my Citrix XenApp 6.5 server.

The problem looks to be with the Citrix Graphics Driver – vdtw30.dll

Patched the Citrix Xen-App hosts with the latest Hotfix Rollup Pack which was Pack 7.
https://support.citrix.com/article/CTX129229

Then applied the following hotfix (KB2748302) from Microsoft which specifically resolves the above BSOD:
https://support.microsoft.com/en-au/help/2748302/stop-error-when-you-use-a-citrix-xenapp-application-in-windows

Error – Group Policy Client service failed the logon

Got a call about a user receiving the following error when trying to open Citrix applications after their account was created.

 

Tried to find the user profile under C:\Users on the Citrix XenApp servers but no luck. Wasnt there.
Normally with this error you would rename the old account to <username>_old on the Citrix XenApp servers.

 Ask the user if he ever had an account and he said yes he one 2 years prior. Double check Active Directory and looks like the

 Solution: rename the new account to <username>1 (with a 1) and user was able to open applications.

Lesson learnt: dont delete user accounts from Active Directory if disabled. Causes more of a headache down the line.