Microsoft released several KBs for January 2022 Patch Tuesday that have now been pulled, after various issues were discovered.
There were several critical bugs that led to domain controllers rebooting, Hyper-V to cease working, and ReFS volumes becoming inaccessible.
The specific updates are KB5009624 (Monthly Rollup) and KB5009586 for Windows Server 2012 R2, KB5009546 for Windows Server 2016, KB5009557 for Windows Server 2019, and KB5009555 for Windows Server 2022.
If you have any of these KBs presently installed, please uninstall and install the latest KBs that address the respective versions, per the links above.
KB5009546 for Windows Server 2016 breaks server connectivity to Active Directory from SecureAuth Identity Platform 20.06 Hotfix 9 even when the KB is not applied to the domain controllers.
This needs to be acknowledged by SecureAuth and published as a known issue.
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