Windows Update Error 800B0001

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I got the following error attempting to check for updates against my WSUS server from a Windows 7 system.


Looking closer at the WindowsUpdate.log file (C:windowsWindowsUpdate.log), I see the following:

2014-07-17	17:10:00:141	 936	e28	Agent	  * Search Scope = {Machine}
2014-07-17	17:10:00:141	 936	e28	Setup	Checking for agent SelfUpdate
2014-07-17	17:10:00:142	 936	e28	Setup	Client version: Core: 7.6.7600.256  Aux: 7.6.7600.256
2014-07-17	17:10:00:173	 936	e28	Misc	Validating signature for
2014-07-17	17:10:00:179	 936	e28	Misc	 Microsoft signed: Yes
2014-07-17	17:10:00:179	 936	e28	Misc	WARNING: Digital Signatures on file are not trusted: Error 0x800b0001
2014-07-17	17:10:00:180	 936	e28	Setup	WARNING: SelfUpdate check failed to download package information, error = 0x800B0001
2014-07-17	17:10:00:180	 936	e28	Setup	FATAL: SelfUpdate check failed, err = 0x800B0001
2014-07-17	17:10:00:180	 936	e28	Agent	  * WARNING: Skipping scan, self-update check returned 0x800B0001
2014-07-17	17:10:00:184	 936	e28	Agent	  * WARNING: Exit code = 0x800B0001

I needed to install KB2720211 on my WSUS server because the client has been updated to the new Windows Update Agent, and the new WUAgent cannot talk to an older WSUS3SP2 server.

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