Came across an issue where drive mappings from the DFS Namespace would show up correctly for the first user that logs in. Each additional users the drive mappings from would show as "Disconnected Network Drive" with a Red X. In the logs the error was logged as, Group Policy object did not apply because it failed with error code '0x80070055 The local device name is already in use.'
OS: 2012 R2 Fully patched as off 6/30/215
RDS and Citrix XenApp 7.6
UAC is disable not by GPO but by pulling bar to lowest level
DFS Namespace used for all drive mappings profiles
Drives mapped through GPO Preferences
2 drives of the 6 mapped using namespace will one show as connected for 1st user to login after that the other users get "Disconnected Network Drive" with a Red X. You can double-click and gain access to the drive but it continues to be shown as disconnected.
Attempts to resolve:
Changed mappings to login script instead of GPO...no change
Changed different settings on the drive mappings in GPO...no change
Many other solutions tested, not worth mentioning...no change
Created a Computer Based GPO and in Preferences - Registry deleted the following registry key:
This solved the issue!