Windows Server 2008 R2 Security Patches Break SharePoint 2010 User Authentication
Today I had to restore user authentication on a SharePoint farm. The farm had been functional yesterday, but upon arriving into work this morning users would get a low-level error message when trying to log in.
Microsoft pushed out some security patches yesterday for Windows Server 2008 R2. A discussion of some of the problems encountered by users can be found here.
I found that on this farm, the Forefront Identity Manager Synchronization Service failed to start, which in turn broke the User Synchronization Service, which then broke user authentication.
I removed the following updates to restore user authentication:
Uninstalling all five of these updates may be more than is necessary, but will fix the problem.
This farm's application server did not have Windows Server 2008 R2 Service Pack 1 installed, so that may be a precondition of these errors occurring.
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