My users have recently started to receive the Zenworks Configuration
Management login window on login. The window displays about 5 minutes
after they authenticate to our Active Directory. When the users enter
their AD login and password in this window, it fails to authenticate.
The users can click cancel and login without incident (although no
access to user assigned applications, only device assigned applications).

Our active directory users source is working correctly as I can navigate
it via Zenworks Configuration Manager.

After enabling debugging I am receiving the following error from my
ZENLGN.LOG on logon:
ObtainAuthToken Failed: 0XC7FF001B

I have verified that the CASA service is running on the Zenworks Server
(Win2K3 Standard R2).

Any ideas?