How to add back Authorized DHCP servers?

Eaven HUANG 2,156 Reputation points
2023-12-04T08:31:48.23+00:00

Dear All,

We are a DC in production that is still running on Windows Server 2012 R2. The issue is that we used DHCP tools from Windows 11 client machine, right-click on the DHCP icon and accidentally click "Unauthorize" on one of the servers on the list of Authorized DHCP servers under Manage Authorized Servers.

I didn't see how bad this is but how can we add it back to the Authroized DHCP servers list, and how to resume everything? I logged into that server let's called DC1, the DHCP service is still there and new machine can still get the IP address from it. When I right-click on this server, there is only Unauthorized option, but no Authorize, do we still need to re-authorize it?

Any advice would be really appreciated.

dhcp

Windows Server 2012
Windows Server 2012
A Microsoft server operating system that supports enterprise-level management, data storage, applications, and communications.
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Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
12,524 questions
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.
1,034 questions
Accepted answer
  1. Dave Patrick 426.4K Reputation points MVP
    2023-12-04T14:41:25.2933333+00:00

    You could check it first. This example gets the list of all computers that run the DHCP server service which are authorized in the Active Directory domain. 

    Get-DhcpServerInDC

    then if needed you can; This example adds an object in the Active Directory domain for the DHCP server service that runs on the computer that has the DNS name dhcpserver.contoso.com and the IP address 10.10.10.2, and authorizes the DHCP server service to serve DHCP clients on the network.

    Add-DhcpServerInDC -DnsName "dhcpserver.contoso.com" -IPAddress 10.10.10.2

    --please don't forget to close up the thread here by marking answer if the reply is helpful--

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