We're experiencing the same thing with all our Windows Server 2012 R2 servers.
KB5009624 breaks Hyper-V in Windows 8.1
KB5009624 breaks Hyper-V in Windows 8.1
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Matt Buckholdt 1 Reputation point
2022-01-12T17:24:46.233+00:00 I can confirm we are experiencing the same issue with all of our Windows Server 2012 R2 servers as well...
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DragonKing 1 Reputation point
2022-01-12T21:04:05.217+00:00 For us, it was actually uninstalling 5009595 that fixed it. We had installed both at the same time.
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Anonymous
2022-01-12T21:09:06.493+00:00 Seems to be somewhat of a known issue.
https://borncity.com/win/2022/01/12/windows-server-2012-r2-januar-2022-update-kb5009586-brickt-hyper-v-host/--please don't forget to
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DragonKing 1 Reputation point
2022-01-12T21:11:13.677+00:00 There was a lot of discussion about it on Reddit, too... https://www.reddit.com/r/sysadmin/comments/s24o7k/kb5009624_breaks_hyperv/