Failure when demoting a DC…

I was tasked with migrating from 2008 to 2012 R2 DCs. The new DC had been promoted. FSMO had been transferred.  Dcdiag and repadmin looked good…no signs of issues.

However, when I went to demote the old DC, I received the following error:


The operation failed because:

Active Directory Domain Services could not transfer the remaining data in directory partition DC=ForestDNSZones,DC=DOMAIN,DC=LOCAL to Active Directory Domain Controller {New DC}.

“The directory service is missing mandatory configuration information, and is unable to determine the ownership of floating single-master operation roles.

My Google-fu was strong that day and I came across this:

Sure enough, correcting the FSMO owner references from a long gone DC to the current FSMO role holder resolved the issue.




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