WSUS 3.0 SP2 will not run after installing update 2720211

Let me clarify that post subject up there. KB2720211 FAILED to install on my server and at the same time absolutely FUBAR’d the entire thing to the point where Update Services wouldn’t even start. I had our lead programmer stop by this morning and tell me that his computer kept complaining about not being able to download updates… (Note to self — add that into Nagios as I appear to have forgotten).

Anway, what a mess. I logged onto the server and along with the MMC not opening, and being greeted with an IIS worker crash warning the event log was chock full of errors:

Event ID 1011: A process serving application pool ‘WsusPool’ suffered a fatal communication error with the World Wide Web Publishing Service. The process id was ‘7540’. The data field contains the error number.
Event ID 7031: The Update Services service terminated unexpectedly.  It has done this 1 time(s).  The following corrective action will be taken in 300000 milliseconds: Restart the service.
Event ID 18456: Login failed for user ‘NT AUTHORITY\NETWORK SERVICE’. [CLIENT: <named pipe>]
Event ID 7032: The WSUS administration console was unable to connect to the WSUS Server via the remote API.

I’m sure you get the point…

Anyway, it appears this was a fairly widespread issue (great QA work MS). I found one solution that worked for me – copied here (just in case):
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