Description of the update for Live Communications Server 2005 Service Pack 1: September 2008

This article describes an update for Live Communications Server 2005 Service Pack 1 (SP1) that is dated September 2008.

The changes that the update contains

The authentication protocol that is used by Microsoft Office Live Communications Server 2005 and its clients has been updated to require a signature in all messages. This includes the first message that carries the challenge response. The version number of the protocol that is advertised in the challenge response has been increased to 2. Challenge responses that use version 2 of this protocol must contain a signature. The signature is a digest of the identifying headers in the message. The signature is calculated by using the session key.

Additionally, to make sure that Communicator 2005 works effectively against this update, a hotfix for Communicator 2005 will be released soon.

Update information

The following file is available for download from the Microsoft Download Center:
Download the update package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=327C9224-E1E8-45F7-A527-195C73EF49B3) Release Date: September 2008

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Important This update must be applied to servers that are configured in the following server roles:

• Office Live Communication Server 2005 Standard Edition (SE) servers
• Office Live Communication Server 2005 Enterprise Edition (EE) front-end servers
• Servers that are configured as Director
• Servers that are configured as Access Proxy

Prerequisites

The following list contains prerequisites for the hotfix:

• To apply this update, you must have Office Live Communications Server 2005 Service Pack 1 (SP1) installed.
  
  For more information about how to obtain Live Communications Server 2005 SP1, click the following article number to view the article in the Microsoft Knowledge Base:
  897674  (http://support.microsoft.com/kb/897674/ ) How to obtain Live Communications Server 2005 Service Pack 1
• To apply this update, you must have hotfix 911996 applied.
  
  For more information about hotfix 911996, click the following article number to view the article in the Microsoft Knowledge Base:
  911996  (http://support.microsoft.com/kb/911996/ ) Description of the update for Live Communications Server 2005: February 10, 2006, rereleased July 11, 2006

Restart information

You do not have to restart the computer after you apply this update.

Update replacement information

This update does not replace any other updates.

File information

This update may not contain all the files that you must have to fully update a product to the latest build. This update contains only the files that you must have to correct the issues that are listed in this article.
The English version of this update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: