My servers are in an Active Directory forest (Server 2003 functional domain level). I have 2 AD DCs that are also GCs and a 3rd that is not a GC. I recently demoted a Server 2003 R2 server from the forest (we'll call this DCOLD). It held all of the FSMOs but I moved them to other servers before demotion. Now, after demotion, the server that I transfered most of the FSMO roles to (DC1 - Server 2008 R2) is having replication issues with the other two (DC2 - Server 2008 - and DC3 - Server 2003 R2). I'm getting error 13508 (Source NtFRS) on DC1 which reads:
The File Replication Service is having trouble enabling replication from DC2 to DC1 for c:\windows\sysvol\domain using the DNS name dc2.domain.local. FRS will keep retrying.
Following are some of the reasons you would see this warning.
 FRS can not correctly resolve the DNS name dc2.domain.local from this computer.
 FRS is not running on dc2.domain.local.
 The topology information in the Active Directory Domain Services for this replica has not yet replicated to all the Domain Controllers.
This event log message will appear once per connection, After the problem is fixed you will see another event log message indicating that the connection has been established.
A second later, I receive the same warning on the same machine (DC1) about replication between DC3 and DC1. Obviously, since SYSVOL isn't replicating, group policy application isn't working and I'm getting errors 1645, 1655, and 1126 from ActiveDirectory_DomainService. Results of DCDiag will be posted in the next reply.