Microsoft KB Archive/239495

= Proxy User May Receive Old Data From a Web Site =

Article ID: 239495

Article Last Modified on 12/2/2005

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APPLIES TO


 * Microsoft Proxy Server 2.0 Standard Edition

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This article was previously published under Q239495



SYMPTOMS
When you are browsing the Web through the Microsoft Proxy Server 2.0 Web Proxy service, the client may receive old data in the browser.



CAUSE
If a client request contains an If-Modified-Since entry in the HTTP header and the target object is cached but expired, the proxy adds a second If-Modified-Since header, which is an undefined condition in HTTP. This is a fairly common condition because of browser caching and downstream proxy caching. Depending on which If-Modified-Since entry the publishing server decides to honor, the problem could lead to old data getting returned the client.



RESOLUTION
To resolve this problem, obtain and install Microsoft Proxy Server 2.0 Service Pack 1 SP1. For more information about Microsoft Proxy Server 2.0 Service Pack 1, please see the following article in the Microsoft Knowledge Base:

238375 Proxy Server 2.0 Service Pack 1: List of Fixes



STATUS
Microsoft has confirmed that this is a problem in Proxy Server version 2.0.

The problem is corrected by Microsoft Proxy Server 2.0 Service Pack 1.



MORE INFORMATION
For additional information, visit the Microsoft Proxy Web site:

http://www.microsoft.com/isaserver/evaluation/previousversions/default.mspx

Keywords: kbprb KB239495

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