Microsoft KB Archive/824246

= FIX: Response That Contains the Cache-Control: s-maxage=0 Header Does Not Expire Immediately =

Article ID: 824246

Article Last Modified on 6/14/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2000 Standard Edition
 * Microsoft Internet Security and Acceleration Server 2000 Service Pack 1

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SYMPTOMS
If you use Internet Security and Acceleration (ISA) Server 2000 in either a Web publishing scenario or a Web proxy scenario, ISA Server may not immediately expire a response that contains the Cache-Control: s-maxage=0 header. This header is used to tell a proxy server not to use an entry after it is delivered to the requesting client unless it first revalidates the entry with the origin server. A value of 0 means that the cached response should expire immediately.



CAUSE
This problem occurs because ISA Server does not immediately expire the content. ISA Server waits for the current time to be greater than the request time in whole seconds. ISA Server incorrectly returns cached content for new requests that are made to the same resource within the same second without first revalidating the entry with the origin server.



RESOLUTION
A supported hotfix is now 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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
You must install ISA Server 2000 Service Pack 1 (SP1) before you install the following hotfix. For additional information about how to obtain the latest ISA Server service pack, 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

File Information
The English version of this fix has the file attributes (or later) 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 --  10-Jul-2003  18:42  3.0.1200.281      178,448  Mspadmin.exe 10-Jul-2003 18:41  3.0.1200.281      103,184  Msphlpr.dll 10-Jul-2003 18:41  3.0.1200.281      392,464  W3proxy.exe 10-Jul-2003 18:41  3.0.1200.281      299,280  Wspsrv.exe Note This fix also applies to the French, German, Spanish, and Japanese versions of ISA Server.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
For additional information about Cache-Control headers, see section 14.9 in the Hypertext Transfer Protocol -- HTTP/1.1 RFC 2616.

Keywords: kbhotfixserver kbqfe kbhotfixserver kbqfe kbbug kbisaserv2000presp2fix KB824246

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