Microsoft KB Archive/258141

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

Article ID: 258141

Article Last Modified on 1/27/2007

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APPLIES TO


 * Microsoft Internet Explorer 5.5
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 5.5
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.5
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 5.5

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This article was previously published under Q258141



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.



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 the Microsoft 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 the Microsoft Knowledge Base:

267954 How to Obtain the Latest Internet Explorer 5.01 Service Pack



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.

Keywords: kbbug kbfix kbqfe kbie550presp1fix kbie550sp1fix kbie501presp2fix kbhotfixserver KB258141

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