Article ID: 915421 - View products that this article applies to.
Consider the following scenario. You have Web browser clients that are located behind a Microsoft Internet Security and Acceleration (ISA) Server 2004 computer. This ISA Server 2004 computer has Service Pack 2 (SP2) installed. One of these Web browsers tries to access external Web sites. In this scenario, you experience the following symptoms:
This problem occurs because ISA Server adds space between some headers and their values. For example, the following header information may be sent by an ISA Server computer to the Web server:
Header:<space><space>example.comWhen this behavior occurs in the host header, some Web servers incorrectly interpret this as a host name that starts with a space. Therefore, the Web server may redirect the browser to a URL that contains a space. For example, the Web server may redirect the browser to a URL that has the following format:
http://<space>example.comThen, the Web browser tries unsuccessfully to access the malformed URL.
To resolve this problem, obtain the Update Rollup for ISA Server Services. For more information about the Update Rollup for ISA Server Services, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/916106/ )Update for HTTP issues in Internet Security and Acceleration Server 2004 Service Pack 2
ISA server adds space between some headers and their values when certain Web filters are enabled. To work around this problem, disable the following Web filters:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the description of the standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates
Article ID: 915421 - Last Review: December 4, 2007 - Revision: 1.6