For some reason your active directory server didn't return the expected result to the query which resolves the user roles. We haven't seen this error before and don't know what is causing it.
Ha, and I used to be a Novell Network Engineer. Not surprised the answer couldn't be that simple.
Well, temporarily setting the Domain Controller's Event Security log to log everything to see what it says after an attempted logon is perhaps a good place to start... Stuff like this is often caused by DNS & SSL issues.
I remember one case this query could fail - if the domain user doesn't belong to any group or role. @Rija you can test with a different user if the one you try does not belong to any group.