Microsoft KB Archive/258546

= Cannot Retrieve Default Web Site from External Network when Proxy Server Is Installed on the Same Computer =

Article ID: 258546

Article Last Modified on 6/24/2004

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APPLIES TO


 * Microsoft Internet Information Server 4.0
 * Microsoft Internet Information Services 5.0
 * Microsoft Proxy Server 2.0 Standard Edition

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This article was previously published under Q258546



SYMPTOMS
When you install Microsoft Proxy Server on a Web server, the Default Web Site cannot be retrieved by default from the external network even though the All Unassigned option is selected in the properties for the Default Web Site.

The following error messages may occur:

10053 Software caused connection to abort

Internet Explorer cannot open the Internet site http:// /.

The server returned an invalid or unrecognized response

Any other Web site that uses the All Unassigned option or specifies an IP address can be viewed on the outside network.



CAUSE
This behavior occurs because the W3proxy.dll file is running as an ISAPI extension in the Default Web Site. The W3proxy.dll file filters out the requests, and rejects all incoming connections. It only accepts the incoming connections after the Enable Web Publishing setting is selected.

Any other Web site that does not contain the W3proxy.dll file as an ISAPI extension is not bound by the Enable Web Publishing setting of Web Proxy.

Web Proxy only runs on the Default Web Site. This behavior is by design for Proxy Server 2.0. Also, the Default Web Site should not be changed. In other words, do not change the IP addressing, Default Web Site name, or the local path. General practice is not to change it at all; however, you can add virtual directories to the Default Web Site.



WORKAROUND
Select the Enable Web Publishing setting in Web Proxy and send all requests to the local server.

Keywords: kbprb KB258546

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