Microsoft KB Archive/936833

= You cannot establish a connection to a Communicator Web Access server =

Article ID: 936833

Article Last Modified on 9/11/2007

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APPLIES TO


 * Microsoft Office Communicator Web Access

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SYMPTOMS
You cannot establish a connection to a Microsoft Office Communicator Web Access server. The connection is silently dropped, and the client endpoint never receives a response.



CAUSE
This problem occurs if the Via header contains a connection request branch ID that does not use the &quot;z9hG4bK&quot; prefix as specified by the RFC 3261 Session Initiation Protocol (SIP) specification. Without this prefix, Communicator Web Access drops incoming requests from peer SIP endpoints.



How to obtain the update
This issue is fixed in the Communicator Web Access update package that was released on May 25, 2007. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

937431 Description of the Communicator Web Access update package, May 25, 2007



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Keywords: kbconnectionfailures kbhotfixrollup kbqfe kbbug kbfix kbpubtypekc KB936833

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