Microsoft KB Archive/919477

= WinHTTP may not connect through a proxy server if proxy auto-configuration is used for Internet Explorer connectivity in Windows XP =

Article ID: 919477

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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SYMPTOMS
Windows HTTP Services (WinHTTP) may not connect through a proxy server if proxy auto-configuration is used for Microsoft Internet Explorer connectivity in Microsoft Windows XP.



CAUSE
This issue occurs because WinHTTP does not read the location for the auto-proxy configuration file (.pac file) string that is located in the registry. The Internet Explorer automatic configuration script file writes the string to the registry.



MORE INFORMATION
The automatic configuration script file contains the string that WinHTTP has to reference. The following is a sample string: AutoConfigJSURL=http://www.mysite.com/proxy.pac



Hotfix information
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

File information
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 item in Control Panel.



For more information about the fix for this issue in Microsoft Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:

919479 WinHTTP may fail to connect through a proxy server if proxy auto-configuration is used for Internet Explorer connectivity in Windows XP



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Keywords: kbwinxpsp3fix kbwinxppresp3fix kbfix kbbug kbhotfixserver kbqfe kbpubtypekc KB919477

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