A couple of months ago I added our 2008 R2 server as a DC to our domain controlled by our 2003 SBS server. Everything appeared fine, and AD was replicating; however, the 2003 server has now crashed, and the 2008 server will not process domain logins consistently. Also, I try to access Active Directory Users and Computers, I am met with:
"Naming information cannot be located because: The specified domain either does not exist or could not be contacted. contact your administrator to verify that your domain is properly configured and is currently online."
I can sometimes choose Change Domain by right clicking, and the old 2003 and 2008 DC's show up, with 2008 showing online. If I choose the 2008 server, services begin working again. However, only sometimes the server shows up, and manually entering it does not work. When it does show up in the list, and I choose the 2008 server, the connection only lasts for 20-30 minutes, and then then I am back to no logins and administrative functions giving me the error above. Any help is greatly appreciated.