Microsoft confirms WSUS service degradation impacting all versions of Windows

Microsoft confirms a WSUS service issue causing slow syncs and timeouts across supported Windows client and Server versions.

Most of us are pretty accustomed to new issues arising after Patch Tuesday updates, such as those impacting performance, the Recycle Bin, Office apps, and more. However, as organizations and IT admins were heading into the weekend, Microsoft confirmed a seemingly major Windows Server Update Service (WSUS) issue impacting all versions of Windows client and server.

On its Windows Release Health dashboard, Microsoft has added a July 17 entry indicating that WSUS is experiencing a service degradation. Due to this, enterprise customers will experience increased synchronization times or sync operation timeouts on WSUS servers. Interestingly, it does not seem to have originated from July 2026's Patch Tuesday as the issue started in "recent days" and caused peak degradation around July 13. As a reminder, Patch Tuesday was on July 14, and this seems like a server-side problem on Microsoft's side anyway.

Microsoft says that the problem is due to a "buildup of publishing metadata." It says that it is working on patching the issue and performance is expected to improve as server-side repairs are completed and rolled out. This should also cause synchronization times to return to normal.

For those unaware, WSUS enables IT admins to centrally deploy Microsoft product updates, security patches, and hotfixes to PCs on the corporate network. As such, it is an integral part of many organizations' infrastructure.

Microsoft says that the affected platforms include:

• Client
  • Windows 11, version 26H1
  • Windows 11, version 25H2
  • Windows 11, version 24H2
  • Windows 11, version 23H2
  • Windows 10, version 22H2
  • Windows 10, version 21H2
  • Windows 10, version 1809
  • Windows 10 Enterprise LTSC 2019
  • Windows 10 Enterprise LTSC 2016
  • Windows 10, version 1607
• Server
  • Windows Server 2025
  • Windows Server 2022
  • Windows Server, version 1809
  • Windows Server 2019
  • Windows Server 2016
  • Windows Server 2012 R2
  • Windows Server 2012

IT admins likely won't be pleased that such an issue has carried into the weekend. However, Microsoft has assured customers that it is working on issuing a concrete fix for the problem, and will release an update shortly.

Source

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Posted Sunday 19 July 2026 at 7:36 am AEST (my time).

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