Microsoft has released an update for HTTP issues in Microsoft Internet Security and Acceleration (ISA) Server 2004 Service Pack 2 (SP2). This update corrects the problems that are described in the following Microsoft Knowledge Base articles:

•	For more information about this topic, click the following article numbers to view the articles in the Microsoft Knowledge Base: 915045 (http://support.microsoft.com/kb/915045/) Error message when you try to access a Web site from a Web browser client that is located behind a computer that is running ISA Server 2004 with Service Pack 2: "Error Code: 502 Proxy Error"
•	915421 (http://support.microsoft.com/kb/915421/) Error message when a Web browser tries to access external Web sites from behind an ISA Server 2004 computer that has Service Pack 2 installed
•	915422 (http://support.microsoft.com/kb/915422/) Some content is unavailable when a user or a program tries to access a Web site through a computer that is running ISA Server 2004 Service Pack 2
•	916573 (http://support.microsoft.com/kb/916573/) Error message in OWA when you try to download a .zip file from a server that is running ISA Server 2004 Service Pack 2: "500 Internal Server Error. Not implemented (-2147467263)"
•	917134 (http://support.microsoft.com/kb/917134/) The "Background Intelligent Transfer Service" option is incorrectly available for any non-Microsoft Update cache rule that you create in ISA Server 2004

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Update information

The following files are available for download from the Microsoft Download Center:
Update for HTTP Issues for Microsoft Internet Security and Acceleration (ISA) Server 2004 Enterprise Edition with Service Pack 2Download the ISA 2004 Enterprise Edition for HTTP issues update package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=EBC32D50-2E9F-4D55-AEFF-EEBA511827B0)Update for HTTP Issues for Microsoft Internet Security and Acceleration (ISA) Server 2004 Standard Edition with Service Pack 2Download the ISA 2004 Standard Edition for HTTP issues update package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=2AA53EE6-527C-4398-AB7C-FCF8E8DDE8CE) Release Date: April 10, 2006

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file. A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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File information

The English version of this update uses a Microsoft Windows Installer package to install the hotfix. The dates and times for these files are listed in Coordinated Universal Time (UTC) in the following table. When you view the file information, the date is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
ISA Server 2004, Enterprise Edition

File name	File version	File size	Date	Time
Comphp.dll	4.0.3443.610	167,704	31-Mar-2006	22:02
Complp.dll	4.0.3443.610	63,256	31-Mar-2006	22:02
Msfpcsnp.dll	4.0.3443.610	4,655,896	31-Mar-2006	22:02
Mspmsg.dll	4.0.3443.610	254,232	31-Mar-2006	22:02
W3filter.dll	4.0.3443.610	748,824	31-Mar-2006	22:02
Wspsrv.exe	4.0.3443.610	1,064,216	31-Mar-2006	22:02

ISA Server 2004, Standard Edition

File name	File version	File size	Date	Time
Comphp.dll	4.0.2165.610	167,192	01-Apr-2006	00:10
Complp.dll	4.0.2165.610	63,768	01-Apr-2006	00:10
Msfpcsnp.dll	4.0.2165.610	3,573,528	01-Apr-2006	00:10
Mspmsg.dll	4.0.2165.610	230,680	01-Apr-2006	00:10
W3filter.dll	4.0.2165.610	732,952	01-Apr-2006	00:10
Wspsrv.exe	4.0.2165.610	941,336	01-Apr-2006	00:10

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If you use a computer that is running Microsoft Small Business Server 2003 Premium Edition with ISA 2004, you may not be prompted for reboot. To ensure that the patch is applied correctly on SBS computer, this patch should be installed using the following command:

msiexec /p "<PATH TO HOTFIX>\ISA2004SE-KB916106-x86-ENU.msp" REBOOT=FORCE 

Note: <PATH TO HOTFIX> is the location where you saved the hotfix .MSP file.
For more information about the terminology that is used to describe Microsoft software updates, click the following article numbers to view the articles in the Microsoft Knowledge Base:

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