I have a small test network with 2 DC's. My original DC was Windows Server 2008 R2 Core. I joined a Windows Server 2012 Core DC to replace the old one; then once the 2008 was removed, I raised the functional level to Server 2012.
The Server 2012 Core server is functioning correctly and works as a DC\GC, but when I join a second DC (Server 2012 Full UI), I can't get the SYSVOL and Netlogon shares to appear, and the new server won't authorize logons.
It looks like the original 2012 Core is trying to use FRS to replicate, while the new one appears to be trying to use DFS. Only the second DC shows up in the DFS manager, and I can't see a way to add the first one to the set.
The second DC appears to throw an error that says that its "Waiting on initial synchronization" from the first dc. Is there a way to add this other original DC to the DFS replication?