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Demoting old remnants of Domain Controller from Active Directory

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Last Modified: 2017-03-24
Hi All,

When I perform the repadmin /replsum command, I can see there is an error pointing to the oldDC12.domain.com ?

And also when I do netdom query dc command the old DC is still there.

How can I safely decommission it without causing any issue with Exchange and AD replication ?
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Nagendra Pratap SinghDesktop Applications Specialist
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Commented:
What is the EXACT error?
Senior IT System EngineerSenior Systems Engineer
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Commented:
The replication error.

Pretty much the Domain controller has been turned off or not properly decommissioned. So how do I clean it up safely ?
Principal Support Engineer
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Senior IT System EngineerSenior Systems Engineer
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Commented:
Thanks Dave.

So I assume that the normal AD replication and Exchange is not impacted when I remove this old DC remnants.
DrDave242Principal Support Engineer
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Senior IT System EngineerSenior Systems Engineer
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Commented:
Thanks !
Senior IT System EngineerSenior Systems Engineer
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Commented:
Hi DAve,

which path should I choose ?

To clean up server metadata by using Active Directory Users and Computers
or
To clean up server metadata by using Active Directory Sites and Services

or do I follow both steps ?
DrDave242Principal Support Engineer
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Commented:
Clean it up using AD Users and Computers first. Once that's done, launch AD Sites and Services. The deleted server will probably still be listed there, but it'll be just an empty container - there won't be an NTDS Settings object inside it. Delete the server from there as well.

You may also need to delete DNS records referring to the server after that. In my experience, the metadata cleanup sometimes removes these records but not always, and I'm not sure why it's inconsistent.
Senior IT System EngineerSenior Systems Engineer
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Commented:
Ok that does make sense.
Thank you once again.

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