Short version: one of our domain controllers has DFSR Event 5008 errors, regarding a domain controller that has be demoted and removed from our domain. It is the only domain controller, of five, to have this error, the other four domain controllers are clean.
Longer version: we are in the process of upgrading Active Directory from 2008 to 2012 R2, at this time we have three 2012 R2 servers and one of those three owns all the FSMO roles, it also happens to be the one that we see the DFSR Event 5008 errors on. In addition to those three 2012 R2 servers, we have two 2008 servers remaining, until we clear up the remaining errors.
DFS Replication, on DC-2012-1, says that it failed to communicate to partner DC-2008-2; however, that is to be expected since DC-2008-2 is no longer a domain controller, nor a member of the domain. When we go into DFS Management and look at the sysvol replication, we do not see DC-2008-2 referenced anywhere, nor have I found a reference to it anywhere else that I have looked.
What can we do remove the reference to the partner, to eliminate these errors?