This article has been archived. It is offered "as is" and will no longer be updated.
When you Web publish servers through Internet Security and Acceleration (ISA) Server, the Microsoft Web Proxy service (W3proxy.exe) may stop responding, and you may either receive a stack dump of the error or a Dr. Watson error message, depending on the disaster recovery options set on the server. In either case, ISA Server no longer services Web Proxy-based traffic, and you must restart the Microsoft Web Proxy service.
This problem may occur if the following registry value is set to 0:
The Web Proxy service uses the ConnectCacheSize registry value to determine how many sessions to maintain to the same remote server in support of clients that use the HTTP 1.1 "Proxy-Connection: Keep-Alive" and HTTP 1.1 "Keep-Alive" request headers.
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
You must have installed ISA Server 2000 Service Pack 1 (SP1) to install this hotfix. For more information about how to obtain ISA Server 2000 Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:
313139 How to Obtain the Latest Internet Security and Acceleration Server 2000 Service Pack
Hotfix replacement information
This hotfix does not replace any other hotfixes.
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name ------------------------------------------------------- 29-May-2003 17:03 3.0.1200.272 178,448 Mspadmin.exe 29-May-2003 17:03 3.0.1200.272 103,184 Msphlpr.dll 29-May-2003 17:02 3.0.1200.272 391,952 W3proxy.exe 29-May-2003 17:03 3.0.1200.272 299,280 Wspsrv.exe
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For additional information about the CacheConnectSize registry value, click the following article number to view the article in the Microsoft Knowledge Base:
822241 ISA Server Web Proxy service maintains connection when client sessions are closed
For additional information about how hotfix packages are named , click the following article number to view the article in the Microsoft Knowledge Base:
816915 New naming schema for Microsoft Windows hotfix packages