401 Unauthorized when i try to connect
Maybe be you can help me, i think i have the same problem that you, but you you have solved the yours.

With a Mac os x, when i run Microsoft Messenger, i can connect to the server office communicator 2007 but when i try connect with Microsoft Communicator 2011, he don't connect 

when i create debug session i have this 

Start-Line: SIP/2.0 401 Unauthorized
.....

Please can you tell me what have you do in gssapi-data and response generation problem for resolved your issue . :)

thanks you 
401 Unauthorized when i try to connect
===

Maybe be you can help me, i think i have the same problem that you, but you you have solved the yours.

With a Mac os x, when i run Microsoft Messenger, i can connect to the server office communicator 2007 but when i try connect with Microsoft Communicator 2011, he don't connect 

when i create debug session i have this 

Start-Line: SIP/2.0 401 Unauthorized
.....

Please can you tell me what have you do in gssapi-data and response generation problem for resolved your issue . :)

thanks you 