Windows Server 2012 caught in reboot loop with error 0xc000021A

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After installing a few recent updates[1], a Windows 20012 R2 server demanded a reboot. Instead of coming back normally it got caught in a reboot loop with error 0xc000021a. The following was attempted but with no success:

  • repair mode
  • last known good
  • safe mode

Most finds on the internet seem to match XP/2000/2003 instead and provided no help. What can be done (short of a complete reinstall)?

[1] I'm not 100% in reconstructing this, but according to what my WSUS reports as "downloaded" for that box, I suppose the updates were KB3084905, KB3094486, KB3095649, KB3095701, KB3096433 - just in case that's helpful.

windows-server-2012-r2
asked on Server Fault Oct 29, 2015 by Hagen von Eitzen

1 Answer

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You can uninstall updates from command line with this code:

wusa /uninstall /kb:{update ID}
answered on Server Fault Mar 8, 2016 by Deniz Kaplan • edited Mar 8, 2016 by Drifter104

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