I had WSUS running for a few months when suddenly it stopped working and gives this error from the server any time I scroll to it in the "Roles".
I've tried resetting the admin console as suggested, but it comes right back to the same error. There are some other issues on the server revolving around IIS and certificates, so perhaps they are related. The server is running on a self-generated certificate (if that matters).
WSUS Error Message:
The WSUS administration console has encountered an unexpected error. This may be a transient error; try restarting the administration console. If this error persists, try removing the persisted preferences for the console by deleting the wsus file under %appdata%\Microsoft\MMC\.
System.NullReferenceException -- Object reference not set to an instance of an object.
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