I ran DC Diag and have errors. We started with one central office. Over time with several branches, I created sites, and place backup DC's in those offices.
Here is the error.
None of the directory servers in the following site that replicate the
following directory partition are configured to use the following transport,
even though the site itself is configured to allow replication over this transport.
An error event occurred. EventID: 0xC0000620
Time Generated: 01/13/2018 12:19:02
I have looked at Sites and Services. I have looked at all the NTDS of all the DC's and they show the transport is IP.
I forced Replication between the DC's the to the box that holds FSMO. I get the same error.
My servers are Server 2012 R2.