Microsoft KB Archive/891251

= You cannot use the SOCKS proxy to connect to the external Web server in Internet Security and Acceleration Server 2004 =

Article ID: 891251

Article Last Modified on 5/18/2006

-

APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2004 Standard Edition

-



SYMPTOMS
When the SOCKS filter is enabled on Microsoft Internet Security and Acceleration (ISA) Server 2004, and a client program makes a request for Web server HTTP content, the client cannot connect to the destination host. You notice this problem if the client program is configured to use the SOCKS proxy on the ISA server. When this problem occurs, the connection resets immediately.



CAUSE
This problem occurs if the connection uses the SOCKS proxy for a protocol that has an application filter enabled on the ISA server.

For example, if you use SOCKS proxy in ICQ, and ICQ uses HTTP protocol, port 80, to connect to the ICQ server, the ICQ connection is broken. This is because ISA Web Proxy is implemented as an application filter that intercepts HTTP, port 80, connections.



WORKAROUND
To work around this problem, use ISA Web Proxy instead of the SOCKS proxy in the client program.

If the client program uses only the SOCKS proxy, you can use ISA Firewall Client to enable traffic to reach an external network like the Internet.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Additional query words: Content maintenance 31199, Haifa SBU 34478

Keywords: kbtshoot kbprb KB891251

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.