Consider the following scenario in a Microsoft Forefront Threat Management Gateway (TMG) 2010 environment:

  • You have an outgoing web proxy server that has anti-malware inspection enabled.

  • The proxy server receives a client request HTML object from a slow web server.

  • TMG uses the standard trickling delivery method to deliver the inspected object to the client.

In this scenario, the client may receive partial content from TMG. For example, if the client request was for an image such as a GIF or JPEG image, the client may receive only the first half of the image. If the client request was received by using JavaScript or by using a cascading style sheet file, the rendering on the client may be corrupted or formatted incorrectly.

Symptoms

This issue occurs because of a problem in the TMG content delivery method when it handles content from an external web server that has slow bandwidth.

Cause

To resolve this issue, install the software update that is described in the following Microsoft Knowledge Base article:

2517957 Software Update 1 Rollup 4 for Forefront Threat Management Gateway (TMG) 2010 Service Pack 1

Resolution

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Status

For more information about the malware inspection delivery method, visit the following Microsoft TechNet website:

Configuring content delivery for malware inspectionThe third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

More Information

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

824684 Description of the standard terminology that is used to describe Microsoft software updates

References

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