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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.

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    You could...... restore it from backup. – Ryan Ries Oct 29 '15 at 17:23
  • You need to boot up to an install disk so you can access a command prompt and view your logs to determine what's wrong. Or, as suggested, restoring from backups should be quicker and easier. – HopelessN00b Oct 29 '15 at 17:59
  • @HopelessN00b Sounds reasonable. Since the last reboot was quite long ago, it is at least possible that it was not the recent action (updates) that broke something ... – Hagen von Eitzen Oct 29 '15 at 21:10
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You can uninstall updates from command line with this code:

wusa /uninstall /kb:{update ID}

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