We seem to be experiencing issues with AD replication after adding two Server 2008 R2 servers to a 2003 domain with existing Server 2003 DCs. I'm not sure where to continue troubleshooting at this point.
We have 3 existing Server 2003 DCs, and are adding 2 new Server 2008R2 DCs. So far, what I've done is moved the Schema Master, Domain Naming Master, and PDC roles over to one of the 2008 R2 servers. This doesn't seem to cause any issues, and I can see from several machines that the roles have transferred (through 'netdom query fsmo', or through the GUI). However, when I attempt to transfer the remaining roles over to the second new DC, the role owner simply shows up as 'ERROR' in the GUI, and doesn't display any owner for those two remaining roles in the command line.
I am noticing some warnings in the Event log, which seem to have something to do with replication.
Event ID 1925 - The attempt to establish a replication link for the following writable directory partition failed.
(The Source directory service is the 2nd new DC.
Right now, both new DCs are pointed to the same DNS server. I have tested remote EventViewer between the DCs to ensure that RPC is working. I am attaching two DCDiags. DC1 is the original Server 2003 DC which held all of the FSMO roles initially. DC4 is the new DC, which I have attempted to transfer Infrastructure and RID roles to unsuccessfully.
All suggestions are greatly appreciated.