Article ID: 941634 - Last Review: October 26, 2007 - Revision: 2.1

After an ISA Server 2006 application filter establishes an HTTP connection, the connection closes before it can be used, and a "0x80004001 (E_NOTIMPL)" status code is logged

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SYMPTOMS

Consider the following scenario:

You develop an application filter for Microsoft Internet Security and Acceleration (ISA) Server 2006.
This application filter establishes an HTTP connection.
An S_OK value indicates that the connection has been successfully established.

In this scenario, the connection closes before it can be used. If you have enabled ISA logging, a "0x80004001 (E_NOTIMPL)" status code is logged.

This problem occurs only if the Web Proxy Filter is enabled for the HTTP protocol.

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CAUSE

This problem occurs because the Web Proxy Filter incorrectly uses sockets and connections that are created by other application filters. Therefore, the Web Proxy Filter cannot be chained to other application filters.

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RESOLUTION

To resolve this problem, apply the hotfix rollup package that is described in Microsoft Knowledge Base article 942639. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

942639 (http://support.microsoft.com/kb/942639/ ) Description of the ISA Server 2006 hotfix package: September 24, 2007

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