Getting Error while demoting last domain controller.

Question

Hi,

I have a query regarding demotion of last Domain controller from our domain.

Actually we have five Dc's in our domain, we have migrated our all five DC's from server 2016 to 2019.
Also have demoted four DC's but getting error while demoting last domain controller that is also running on windows server 2016.

Our Domain Functional level is set to Windows server 2012 and Forest functional level set to Windows server 2008 R2.

Please help me in this regard or give me any suggestion.

Answer 1

Not sure what the problem is but a simple solution may be to turn off the problematic one and perform cleanup to remove its' remnants from active directory.
https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/ad-ds-metadata-cleanup
https://techcommunity.microsoft.com/t5/itops-talk-blog/step-by-step-manually-removing-a-domain-controller-server/ba-p/280564

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