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Tag Archives: Troubleshooting

Kerberos Primer, Part I

Although it is a critical part of Windows Active Directory authentication, the Kerberos protocol is often misunderstood in how it functions.  Because of the critical nature of the protocol to AD, it is crucial that all system administrators know this protocol and the methods available for troubleshooting it.

Posted 13 November 2009 † Jeff Huston § Active Directory ‡ Comments (0) ° Also tagged: , ,

Troubleshooting Presence Unknown in OCS 2007

Another issue in OCS 2007.  A user logs in okay into Communicator (or CWA) and displays her presence just fine.  However, all of her contacts have a status of Presence Unknown.  Reboots, exits and restarts.  Nothing seems to get it to go.
Here’s what is seen in the diagnostic logs (SIPStack, all flags on and UserServices, [...]

Posted 04 September 2009 † Jeff Huston § Communications Server § Uncategorized ‡ Comments (0) ° Also tagged: , ,

Troubleshooting Failed Login in OCS 2007 R2 (480 TEMPORARILY UNAVAILABLE)

Okay, so I had a weird issue.  A user would sign in to Office Communicator 2007 R2.  Their login would fail.  Not terrificly unusual, but when digging in to the trace log on the client, the trace went like this:
Client: REGISTER
Server: 401 UNAUTHORIZED (Normal since anonymous login isn’t allowed and that kicks in the Kerberos [...]

Posted 03 September 2009 † Jeff Huston § Communications Server ‡ Comments (0) ° Also tagged: , ,