Active Directory "Logon attempt Failed"

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I have a Windows Server 2003 Service Pack 1 that is the primary (only) domain controller and all active directory functions suddenly start giving the message:

Naming information cannot be located because:
Logon attempt failed.
Contact your system administrator to verify that your domain is properly configured and is currently online.

As I am the system administrator I contacted myself with disappointing results. I am confident I did something I shouldn't have and I am hoping someone can tell me how to fix it.

BTW, nobody is having any trouble logging on any where on the domain.

Jim Kiser
.

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