Failed DC replication due to server being moved

Pedro Baptista
Pedro Baptista used Ask the Experts™
on
Two separate businesses using the same domain name have now merged into one.
This is the first time I've ran into this and hope someone could shed some light. We've recently acquired a new client who at one point had two domain controllers. Server 2008 and Server 2012. They moved Server 2012 over to a new location as part of a different business, but kept the same domain name. Server 2008 AD sees the 2012 as a DC, However 2012 doesn't see 2008 as a DC. They are now on different networks, but recently was configured to tunnel back to corporate to share resources.

What I'm trying to accomplish: Join a 2016 DC to their corporate to decommission 2008.

Error I'm getting when promoting 2016 to a DC: "Active Directory preparation failed. The schema master did not complete a replication cycle after the last reboot."



What I've gathered so far.

Server 2008 - DC - samedomain.local - Corporate Office

At one point was replicating to 2012.
Server 2012 - DC - samedomain.local - Remote Office

No longer replicating from 2008.
Recently a WatchGuard VPN was put in so the two locations could talk and share resources. Different IP schemes, and they don't know about each other.

My Question: Can I safely remove 2012 DC from 2008 to stop attemping replication and at the same time continue to operate both under the same domain names, but seperate?

Remote Office will still use 2012 to authenticate locally until we can sit down and plan out a migration plan several months from now.

Corporate will still use 2008 to authenticate locally.
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Did I understood correctly. that those 2 domaincontrollers havent's seen each other for a long time?

Author

Commented:
Yes, looking at the dcdiag replication test they last seen each other 3 years ago.
they will never talk to each other again and also DC1 will never accept Clients from DC2.

So...handle them as 2 COMPLETELY different domains, even they have the same domain name...

Author

Commented:
Thank you Thomas.

I am safe to continue with manually removing DC2 that moved from DC1 then and also clearing the meta data?
you can just remove the replication in active directory sites and services. Since I understood you want to keep both DC's but in a different site?
ah wait..yes, you want to joind the 2016 server, make it a DC. move all roles from the 2008 and then decommission the 2008?

Author

Commented:
Yes that is correct
yes, then you can just delete the 2008 server in active directory, it will ask you if you want to clean AD from it...
If the new server has all the FSMO roles etc.

Author

Commented:
very well. thank you again.

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