I am having trouble logging into the Zenworks Agent on a workstation (XP Pro SP3). I've read tons of posts about this issue but I cannot find a solution.

ZCM 10.2.1 is on a SLES 10 SP2 server and installed successfully. The user source is set up to access edirectory and I can browse the directory contents and see the users within the Control Center.

The Agent has been installed manually on the workstation and is registered
under devices in the control center. When I log in to the workstation the
Zenworks login box appears and asks me to enter the user id again which it
then rejects giving an error of "Unable to log into the ZENworks realm because the system has disconnected from the network and the specified credentials did not match with the credentials cached on the system."

I have tried turning SSL on and off for the user source.
If I go into the control center I can see the workstation and its status
is green and I can remote control it.
Thanks for any help or suggestions!