Force KCC (Knowledge Consistency Checker) to run on a domain controller

Sometimes after demoting domain controllers you may be left with inconsistent NTDS connection objects in Active directory. In my case there was an NTDS connection object listed under one of the domain controllers at our central site which referenced a recently demoted domain controller at a remote site. I needed an NTDS connection object pointing pointing to the newly installed DC at the remote site instead. To fix this i simply deleted the incorrect NTDS connection object in the ‘Sites and Services’ console, from the central site domain controller, and then forced KCC to run on the same domain controller by running:

repadmin /kcc

This forces the domain controller that you run the command on to check its inbound replication topology immediately and generate any missing connections. After running this command a new NTDS connection object was generated from the new DC at the remote site. This can either be verified by checking under the Domain Controllers NTDS Settings, in the ‘Sites and Services’ Console or by running:

repadmin /showrepl

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