Microsoft KB Archive/937308

= Error message when you try to log on to Communications Server 2007: &quot;You have been signed out of Communications Service because the service has been temporarily shutdown&quot; =

Article ID: 937308

Article Last Modified on 8/15/2007

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APPLIES TO

 Microsoft Office Communications Server 2007 Enterprise Edition Microsoft Office Communications Server 2007 Standard Edition Microsoft Office Live Communications Server 2005 Service Pack 1, when used with:  Microsoft Office Live Communications Server 2005 Enterprise Edition

 Microsoft Office Live Communications Server 2005 Standard Edition 

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SYMPTOMS
When you try to log on to Microsoft Office Communications Server 2007, you receive the following error message:

You have been signed out of Communications Service because the service has been temporarily shutdown. Please try again later.

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CAUSE
This issue occurs if the following conditions are true:
 * Communications Server 2007 is configured as a Director or as a front-end server.
 * Communications Server 2007 is interoperating with Microsoft Office Live Communications Server 2005 Service Pack 1 (SP1).

When Microsoft Office Communicator 2007 clients interoperate with Microsoft Office Communicator 2005 clients in a Live Communications Server 2005 SP1 environment, Communicator 2007 clients externally connect to a Communications Server 2007 Access Edge server. The Communications Server 2007 Access Edge Server is configured by using a next hop to a Communications Server 2007 Director or to a Communications Server 2007 front-end server. This causes the Live Communications Server 2005 front-end server to record the following error message in the Live Communications Server Session Initiation Protocol (SIP) server logs:

Result-Code: 0xc3ed182c SIPPROXY_E_INVALID_EDGE_PROXY_HEADER

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RESOLUTION
To resolve this issue, apply the Live Communications Server 2005 post-Service Pack 1 hotfix package 921543 on the Live Communications Server 2005 SP1 server. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

921543 Description of the Live Communications Server 2005 post-Service Pack 1 hotfix package: July 21, 2006

Important Apply hotfix 911996 before you apply hotfix 921543. For more information about hotfix 911996, click the following article number to view the article in the Microsoft Knowledge Base:

911996 Description of the update for Live Communications Server 2005: February 10, 2006, rereleased July 11, 2006

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MORE INFORMATION
Communications Server 2007 Access Edge Server will add &quot;edge proxy trust headers&quot; to the Session Initiation Protocol (SIP) packets that must be passed to the Communications Server 2007 front-end servers. This SIP communications are passed to the Live Communications Server 2005 SP1 communications network during an interoperation scenario. Live Communications Server 2005 front-end servers were not originally configured to accept third-party SIP headers. Additionally, the front-end servers would discard third-party SIP headers.

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