Article ID: 2518684 - Last Review: June 15, 2011 - Revision: 2.0 FIX: Outgoing request failures may occur when HTTPS Inspection is enabled and web server connection timeouts occur in a Forefront Threat Management Gateway 2010 environment
SYMPTOMSWhen HTTPS Inspection is enabled in a Microsoft Forefront Threat Management Gateway (TMG) 2010 environment, some outgoing POST requests may be handled incorrectly without a POST body being sent to the external web server. For example, consider the following scenario:
In this scenario, you expect the client to resend the request over a new connection. However, this does not occur because an Internet Explorer issue is exposed. The Internet Explorer issue is described in the following article in the Microsoft Knowledge Base: 895954
(http://support.microsoft.com/kb/895954/
)
When you use Microsoft Internet Explorer or another program to perform a re-POST operation, only the header data is posted Note In addition to the POST error, this scenario/issue TK may also cause random "Page Cannot Be Displayed" error messages for GET requests if multiple connections are timed out. This occurs because Internet Explorer retries GET requests only three times. If the three tries are all made on connections that are timed out externally by the web server, request failures may also occur.RESOLUTIONTo resolve this issue, install the software update that is described in the following article in the Microsoft Knowledge Base: 2517957
(http://support.microsoft.com/kb/2517957/
)
Software Update 1 Rollup 4 for Forefront Threat Management Gateway (TMG) 2010 Service Pack 1 This fix detects that the external connection was timed out by the web server and closes the associated internal client connection. This new behavior avoids the Internet Explorer issue being exposed.After you install this software update, you must enable the new behavior by running the following script:
STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. REFERENCESFor more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: 824684
(http://support.microsoft.com/kb/824684/
)
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