Microsoft KB Archive/178173

= Enabling Access Control in Web Proxy May Return a Blank Page =

Article ID: 178173

Article Last Modified on 9/23/2005

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APPLIES TO


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

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This article was previously published under Q178173



SYMPTOMS
If you enable access control and defined a valid Microsoft Windows NT user or group account in Proxy Server 2.0 installed over Internet Information Server version 4.0 (IIS), the Web Proxy clients may fail to connect and display one of the following error messages:

NOTE: The error message depends on the browser you use.

Microsoft Internet Explorer version 4.0 and 4.01:

Nothing returned to browser (no error or blank page)

Microsoft Internet Explorer version 3.02:

The requested header not found.

Netscape Navigator version 3.02:

Document contains no data.



CAUSE
This issue is caused by a problem with the authentication settings in IIS 4.0 and the Web Proxy ISAPI filter.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack



STATUS
Microsoft has confirmed this to be a problem in Microsoft Internet Information Server version 4.0.



WORKAROUND
Use one of the following methods:

Method 1
Disable Access Control in Web Proxy Service by opening the Web Proxy Properties within the MMC and go to the Permissions tab. Clear the Enable Access Control check box.

Method 2
Disable Anonymous access for the default web site in IIS 4.0.

NOTE: This will enable Proxy clients to connect to the Internet; however, it does not allow anonymous users to connect to the default web site if the server is also used for Internet publishing.

Additional query words: white clear empty

Keywords: kberrmsg kbbug kbqfe kbsetup kbfaq kbpending kbhotfixserver KB178173

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