I have two Server 2003 Domain Controllers. One has all of the FSMO roles (DC1) and one is just a standalone Domain Controller (DC2) with no FSMO roles. I shutdown the standalone Domain Controller (DC2). When I try and RDP into the DC with all of the FSMO roles (as confirmed with the netdom /query fsmo command) it gives me the following error:
"The system cannot log you on due to the following error:
The specified domain either does not exist or could not be contacted.
Please try again or consult your system administrator."
Another symptom is in trying to create a share on another box and in trying to find active directory objects, it couldn't find them, only local computer users.
Looking through the event log there's nothing serious recently.