Question : Windows cannot obtain the domain controller name for your computer network

For some reason, in my Application Log, I get the following error.
When this happens, my server is very slow, and I can't log into my exchange server.
Event ID: 1054
User: NT AUTHORITY\SYSTEM
"windows cannot obtain the domain controller name for your computer network.
{an unexpected network error cocured).  Group policy processing aborted.

Any help on how to fix this error, I would greatly apprecaite it.
Thanks,
Dan

Answer : Windows cannot obtain the domain controller name for your computer network

Can you please run the command

dcdiag /v /c >C:\dcdiag.txt

at the Command Prompt of a DC? It will create a file in C: called dcdiag.txt, which it would be useful if you could upload here for further troubleshooting.

DCDiag is in the Support Tools if not already installed: http://support.microsoft.com/kb/892777

Thanks,

-Matt