Microsoft KB Archive/934301

= ISA Server prevents a file from being downloaded, and the &quot;FWX_E_ABORTIVE_SHUTDOWN&quot; error code is logged in the ISA Server log =

Article ID: 934301

Article Last Modified on 12/4/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2006 Standard Edition
 * Microsoft Internet Security and Acceleration Server 2006 Enterprise Edition
 * Microsoft Internet Security and Acceleration Server 2004 Standard Edition
 * Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition
 * Microsoft Internet Security and Acceleration Server 2000 Standard Edition

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SYMPTOMS
A Web browser client is located behind a server that is running Microsoft Internet Security and Acceleration (ISA) Server. When this client tries to download a file from an external Web site, ISA Server prevents the file from being downloaded. Additionally, the Firewall service returns following error code. This error code appears as a result code in the ISA Server log:

FWX_E_ABORTIVE_SHUTDOWN

Note This error code represents the following error description:

A connection was abortively closed after one of the peers sent an RST packet.

A network trace of the problem may resemble the following:



CAUSE
This problem occurs if the HTTP response from the Web server does not include the file size in the ContentLength header. This situation may occur if the Web server is not RFC-compliant.

The network trace shows the following:
 * In frame 4, the ContentLength header does not include the file size.
 * In frame 5, the server closes its end of the connection by sending a FIN_ACK response to the upstream server.
 * In frame 7, the server sends an RST packet to the upstream server. Therefore, ISA Server logs the FWX_E_ABORTIVE_SHUTDOWN error code.



MORE INFORMATION
This problem occurs even in the following situations:
 * You create a new protocol definition for port 80, and you do not include a proxy filter.
 * You directly disable the Web Proxy filter.

Keywords: kbtshoot kbprb kbexpertiseadvanced KB934301

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