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Old Domain Controllers Showing as Authorized Servers

ECB532 21 Reputation points
2021-06-22T17:32:40.91+00:00

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
Windows DHCP
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
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  1. Anonymous
    2021-06-23T20:09:14.373+00:00

    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--

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  1. ECB532 21 Reputation points
    2021-06-23T21:39:12.477+00:00

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

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  2. ECB532 21 Reputation points
    2021-06-23T21:44:16.593+00:00

    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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  3. ECB532 21 Reputation points
    2021-06-23T21:47:36.127+00:00

    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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  4. ECB532 21 Reputation points
    2021-06-23T22:01:14.277+00:00

    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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