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Having problems demoting DC

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C S

I need to cut loose some 2008R2 DC but Active Directory Domain Services Installation Wizard fails because "Active Directory Domain Services could not transfer the remaining data in directory partition"

I've run through the advice logged in DCPROMO.log

"Operations which require contacting a FSMO operation master will fail until this condition is corrected.

FSMO Role: CN=Infrastructure,DC=ForestDnsZones,DC=XXX,DC=XXXX,DC=XXX

FSMO Server DN: CN=NTDS Settings\xxxx:xxxx-xxx-xxx-xxx-xxxx,CN=DC1\xxxx:xxxx-xxx-xxx-xxx-xxxx,CN=Servers,CN=XXXX,CN=Sites,CN=Configuration,DC=XXX,DC=XXXX,DC=XXX"

  1. I have confirmed on all DC servers via "netdom query fsmo" point elsewhere and consistently.

  2. I have confirmed on all DC servers via "Repadmin" "/queue" "/replsummary" "/showrepl" "/syncall" that replication is consistent and working fine.

  3. Do I miss something or is 3 really just asking the same thing as 1?

  4. Likewise to 2?

I have been looking over ADSIEDIT.MSC but it looks correct on both the server to be demoted and the current FSMO, although I am definitely a bit out of my depth in this tool.

Something definitely isn't entirely right in the domain though as NTP isn't syncing correctly to DCs from the FSMO.

Any thoughts, guidance, help, advice is very appreciated.

https://docs.microsoft.com/en-us/troubleshoot/windows-server/identity/dcpromo-demotion-fails

https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc771844(v=ws.10)?redirectedfrom=MSDN

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