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ECB532-1562 asked DSPatrick answered

Old Domain Controllers Showing as Authorized Servers

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."

windows-dhcp-dns
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DSPatrick answered

Ok, good. Then you can double click CN=DhcpRoot on right then scroll down to dhcpServers attribute and edit to reflect the correct computers. Then restart DHCP service.

--please don't forget to upvote and Accept as answer if the reply is helpful--


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ECB532-1562 answered ECB532-1562 edited

I noticed it doesn't have our current domain controllers listed in the dhcpServers attribute, it only has the old ones. I wonder how DHCP has been working all these years with that being wrong?

Thank you very much for your help on this issue that's been bothering me for so long!

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ECB532-1562 answered

It's safe to delete the old domain controllers after entering the current ones right?

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DSPatrick answered

from dhcpServers attribute? Yes. I'm glad to hear the issue is sorted. I'm not sure why the active ones are not listed. Another check is from PowerShell
Get-DhcpServerInDC


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ECB532-1562 answered

When I run that command it lists the 2 current ones and the 2 old ones, but I haven't made the changes yet.

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DSPatrick answered

Ok, yes and I think you'll need to restart the DHCP service as well after removing the bogus ones.


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ECB532-1562 answered

Is it also safe to delete the old CN=olddomaincontroller.mydomain.com record that's listed under the CN=DhcpRoot file?

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DSPatrick answered

So to clear it's in the CN=NetServices container and the domain controller is gone anyway then yes it should be fine.



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ECB532-1562 answered

Okay thanks. Now when I run Get-DhcpServerInDC it shows the current domain controllers but they are listed twice. Is that okay?

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DSPatrick answered

Did you manually add them also to dhcpServers attribute? At some point I think the location changed. The active ones are also in CN=NetServices right? I think that is sufficient to have them in in CN=NetServices.



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