By Delia / Last update January 18, 2022

After this January's Patch Tuesday event day, Windows Server administrators complained that the new update caused numerous serious problems with their servers. These bad problems included Hyper-V failing to boot, the primary controller experiencing an endless reboot cycle, and ReFS volumes becoming inaccessible and showing up as RAW file systems.


Following these reports, Microsoft appears to have removed the cumulative update from Windows Update, although they have re-released the update with warnings. Now, Microsoft has released an out-of-band update to fix these issues.

This OOB update fixes issues of the January Windows Update

Microsoft released an out-of-band (OOB) update for certain versions of Windows on January 17, 2022. The update resolves issues related to VPN connectivity, Windows Server domain controller reboots, virtual machine boot failures, and removable media in ReFS format failing to install.

All updates can be found in the Microsoft Update Catalog, and some are also available as an optional update in Windows Update. Please check the release notes for your version of Windows for more information.

Updates for the following Windows versions are available as optional updates on Windows Update.

  • Windows 11, version 21H1 (original release): KB5010795
  • Windows Server 2022: KB5010796
  • Windows 10, version 21H2: KB5010793
  • Windows 10, version 21H1: KB5010793
  • Windows 10, version 20H2, Windows Server, version 20H2: KB5010793
  • Windows 10, version 20H1, Windows Server, version 20H1: KB5010793
  • Windows 10, version 1909, Windows Server, version 1909: KB5010792
  • Windows 10, version 1607, Windows Server 2016: KB5010790
  • Windows 10, version 1507: KB5010789
  • Windows 7 SP1: KB5010798
  • Windows Server 2008 SP2: KB5010799

Updates for the following Windows versions are only available on the Microsoft Update Catalog. For instructions, see the KB for your operating system listed below.

  • Windows 8.1, Windows Server 2012 R2: KB5010794
  • Windows Server 2012: KB5010797