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.

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

Answer 2

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

Answer 3

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.

Answer 4

That should be correct having them in CN=NetServices only. As a test here I unauthorized and that removed the server in CN=NetServices, then I reauthorized it and it was added back to CN=NetServices, nothing in the dhcpServers attribute.

Answer 5

I can't find any reference to the old Domain Controllers in AUDC Domain Controllers OU, AD Sites and Services or AD DNS Records. The DCPROMO and deleting was done when the new domain controllers were installed but for some reason the old ones still show up in that 1 spot.