Remove backup AD Domain controller when dead and not present

wifiit used Ask the Experts™

We have Domain with two 2003 AD servers. The one acting as the secondary AD
server failed and we do not wish to repair or restore.
We have attemted to add a new Server as the secondary AD server but while running adprep /forest prep an error was encountered saying:

"Adprep was unable to extend the schema
The schema master did not complete a replication cycle after the last reboot. The Schema Master must complete at least one replication cycle before the schema can be extended.
Veriy that the schema master is connected to the network and can communicate with the other domain controllers."

Is there any way (complex or simple) that we can tell the ROOT AD server that the secondary
AD server is no long available or to be used and make it go back to working
as if it is the ONLY AD server?

I've removed backup AD servers before but it was always planned so we
demoted them or returned them to app server status while they were up and
running. We've never just removed it or had one permenantly fail to the
point we had to go back to the root AD and try to manually remove it from

DO you know if this is a simple thing.

Thanks for any feedback you can provide
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Senior Active Directory Engineer
Top Expert 2012
Run on your DC in command-line

dcpromo /forceremoval and then use NTDSUTIL to do metadata cleanup

It sounds like your secondary DC has failed and is offline. If this is the case you should only need to run a metadata cleanup of the old object in AD. So you should be able to follow the one link iSiek provided to remove this object is AD and then you will be able to extend your schema.
Krzysztof PytkoSenior Active Directory Engineer
Top Expert 2012

Yeah, my mistake. You cannot run /forceremoval on DC which is not in the network anymore :)
Just do metadata cleanup

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