Article ID: 2596388 - View products that this article applies to.
Consider the following scenario:
This problem occurs when the TMG server is under a heavy load of outgoing HTTP requests. Under this load, TMG 2010 can misdirect the outgoing HTTP request to the wrong external web server. This problem does not affect web proxy clients.
To resolve this problem, install the service pack that is described in the following Microsoft Knowledge Base article:
(http://support.microsoft.com/kb/2555840/ )Description of Service Pack 2 for Microsoft Forefront Threat Management Gateway 2010
To work around this problem, configure the client computers as web proxy clients.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
The problem has only been observed when third-party antivirus software is installed on the TMG server. The problem was observed when multiple antivirus vendor software packages were installed on the TMG server.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates
Article ID: 2596388 - Last Review: October 31, 2011 - Revision: 2.0