WSUS bug preventing updates distributed to Windows 11 22H2/Server 2022 fixed

Windows[German]Since February 2022 there was the problem that in Windows Server Update Service (WSUS) updates could not be distributed to clients running Windows 11 22H2 as well as Windows Server 2022. I had even published a corresponding post on the topic in the blog. Now Microsoft has fixed the bug in this area that prevented deploying updates to Windows 11 22H2 as well as Windows Server 2022 in WSUS since February 2022.


There was a blog post Microsoft's February 2023 Patchday: Incorrect updates in WSUS, Exchange and Windows, where I've addressed the problem that after installing February 2023, updates for Windows 11 22H2 as well as for Windows Server 2022 updates could not be distributed successfull via WSUS in certain constellations.

A fix for that WSUS but

Now Microsoft has announced that this problem in WSUS, which prevented the distribution of updates for Windows 11 22H2/Server 2022 in certain scenarios, has been fixed with the July 2023 updates. On the Windows Health status page for Windows Server 2022, there is a corresponding note in the "Resolved Issues" section titled WSUS might not offer updates to Windows 11, version 22H2. It states:

Updates released February 14, 2023 or later might not be offered from some Windows Server Update Services (WSUS) servers to Windows 11, version 22H2.

In a nutshell: Since the security update released in February 2022, there have been problems with the distribution of updates via WSUS. Not only Windows 11 version 22H2 is affected. Microsoft also states that the bug can also affect the distribution of updates for Windows Server 2022. The updates are downloaded to the WSUS server, but may not be pushed to the client devices.

However, this affects only systems with WSUS servers running Windows Server 2022 that have been updated from Windows Server 2016 or Windows Server 2019. The background is that the required Unified Update Platform (UUP) MIME types were accidentally removed from Windows Server 2022. I had pointed out this issue in the German blog post Windows Server Feb. 2023-Updates: Kollateralschäden mit MIME-Typen. Administrators had the option in recent months to manually retrofit affected machines with the definitions for the missing mime types (see Adding file types for Unified Update Platform on premises). According to Microsoft, however, this is no longer necessary, as the issue has been fixed as of July 14, 2023, with security update KB5023705 for Windows Server 2022. (via)

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