Old Domain Controllers Showing as Authorized Servers

Question

I have 2 old domain controllers that no longer exist showing in the "Manage Authorized Servers" in "DHCP", when I try to unauthorize them I get an error that says "There is no such object on the server."

Answer 1

Try right click on ADSI Edit and click connect to. In connection settings, connection point, select or type a Distinguished Name or Naming Context. Enter CN=NetServices,CN=Services,CN=Configuration,DC=Your Domain,DC=com then click ok.

Expand the default naming context, highlight the path in the left pane, and you should see CN=DhcpRoot on the right.

Double click it, and then check for and edit the dhcpServers attribute to reflect the correct computers. The restart DHCP service.

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Answer 2

You can perform some cleanup to remove the non-existent domain controllers.
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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Answer 3

Hi,
Welcome to ask here!
It is suggested to confirm if there are any old reference existing in the domain.
You can check this by:
AUDC domain trollers OU
AD Site and services
AD DNS Records
Or when you run dcdiag and repadmin.

Then try to do a metadata cleanup for the old DCs from other good ones.
https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/ad-ds-metadata-cleanup

Best Regards,

Answer 4

Just checking if there's any progress or updates?

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Answer 5

I find it here.

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