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Host Logic in PAC File May Not Direct Browser to the Intended Proxy Server

Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.
Symptoms
When you click to select the Use automatic configuration script check box and then point the address to a .pac file that is similar to the following sample code, when you view a particular Web site you may not use the proxy server that you intend to in the .pac file.
   if(dnsDomainIs(host,"testhost"))        return "PROXY myproxya:80";   else        return "PROXY myproxyb:80"				
Cause
Under certain circumstances, Internet Explorer caches the proxy server and returns that cached proxy server instead of the server in the else branch of the code.
Resolution

Internet Explorer 5.5

To resolve this problem, obtain the latest service pack for Internet Explorer version 5.5. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
276369 How to Obtain the Latest Internet Explorer 5.5 Service Pack

Internet Explorer 5.01

To resolve this problem, obtain the latest service pack for Internet Explorer version 5.01. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
267954 How to Obtain the Latest Internet Explorer 5.01 Service Pack

Status

Internet Explorer 5.5

Microsoft has confirmed that this is a problem in Internet Explorer 5.5. This problem was first corrected in Internet Explorer version 5.5 Service Pack 1.

Internet Explorer 5.01

Microsoft has confirmed that this is a problem in Internet Explorer 5.01. This problem was first corrected in Internet Explorer version 5.01 Service Pack 2.
Properties

Article ID: 258141 - Last Review: 06/19/2014 07:23:00 - Revision: 4.0

  • kbhotfixserver kbqfe kbbug kbfix kbie501presp2fix kbie550presp1fix kbie550sp1fix KB258141
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