I received the following error when opening ADUC from my laptop:
Naming information cannot be located for the following reason:
The server is not operational.
If you are trying to connect to a somain controller running Windows 2000, verify that Windows 2000 Server Service Pack 3 or later is installed on the domain controller, or use the Windows 2000 administration tools. For more information acout connecting to domain controllers running Windows 2000, see Help and Support.
It was working a week or so ago. The server is pingable and I can run ADUC from the domain server itself. My users account is a member of the Domain Admins user group, which as a member of the Administrators group.