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Unexpected problems after KB5006672

Joshua Wyman 6 Reputation points
2021-10-18T13:39:45.513+00:00

So the other week we installed KB5006672 on some of our Server 2019 VMs and ran into issue with our Domain Controller and ADFS Servers.

After rebooting the DC we noticed that authentication failures occurred for clients, and even doing things like click browse when trying to select another computer in a Management tool like computer management or regedit and error message would popup. On a system that was working normally prior to the DC having the patch installed, Test-ComputerSecureChannel began to show the trust relationship was broken. Using the repair function was failing as well. No replication errors were present or anything shown in the Directory Services application log to hint at any issue.

I uninstalled the KB and rebooted the DC and it all began working normally. The trust relationship showed ok and there were no further issues.

Similarly, after installed the patch on our ADFS server, and rebooting, it lost the ability to communicate with the WID hosted locally on it. Removing the patch also restored that communication.

Anyone run into any similar issues?

Windows Server 2019
Windows Server 2019
A Microsoft server operating system that supports enterprise-level management updated to data storage.
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Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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Windows Server Security
Windows Server Security
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
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  1. Joshua Wyman 6 Reputation points
    2021-11-15T18:32:17.21+00:00

    New details, the same issue was experienced with KB5007206 after the November cumulative was applied. This time however even the ability to connect to the others servers via RDP failed.

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  2. Vadims Podāns 9,111 Reputation points MVP
    2021-11-16T13:54:33.223+00:00

    It appears it is a bug introduced in November 2021 patches. Here is a KB that mentions known issues: https://support.microsoft.com/en-us/topic/november-9-2021-kb5007246-security-only-update-99e6a0cc-f6cc-4887-9219-021707060ebb

    The solution is to not install this update and, probably, wait for December updates in hope that this issue will be fixed there.

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