Article ID: 2484988 - Last Review: January 11, 2011 - Revision: 2.0

A DNS server publishing rule stops working for a DNS server that is published by using Forefront TMG 2010

View products that this article applies to.

System TipThis article applies to a different operating system than the one you are using. Article content that may not be relevant to you is disabled.

SYMPTOMS

When a Domain Name System (DNS) server is published by using a server publishing rule in Microsoft Forefront Threat Management Gateway (TMG) 2010, the publishing rule does not work correctly. Therefore, the incoming User Datagram Protocol (UDP) DNS traffic is not forwarded to the published server. This problem occurs randomly.

Back to the top

CAUSE

This issue occurs because a WSAENETRESET error occurs when a recv operation is completed on the publishing socket that faces the Internet. Additionally, Forefront TMG 2010 does not create another recv operation to compensate for the completed operation that contains this error. Therefore, the data pump stops.

Notes

WSAENETRESET indicates when the Time to Live (TTL) value is exceeded for a UDP socket.
Under UDP standards, any finished operation that encounters an error does not stop the data pump if the error is not caused by closing the socket.

Back to the top

RESOLUTION

Update information

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

2475183 (http://support.microsoft.com/kb/2475183/ ) Software Update 1 rollup 2 for Forefront Threat Management Gateway (TMG) 2010 Service Pack 1

Back to the top

STATUS

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

Back to the top

MORE INFORMATION

For 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/ ) Description of the standard terminology that is used to describe Microsoft software updates

For more information about the recv function, visit the following Microsoft webpage:

Introduction to the recv function (http://msdn.microsoft.com/en-us/library/ms740121(v=vs.85).aspx)

For more information about the kernel-mode data pump, click the following download link to view a Microsoft document:

Document that introduces the ISA Server 2006 firewall core (http://download.microsoft.com/download/e/7/6/e76fdda3-5c2c-4fbb-9c6f-3bcd0ed4b8ef/firewall_corewp.doc)

Back to the top