Microsoft KB Archive/929477

= When you connect to a Web site that uses a client certificate for user authentication, Internet Explorer 6 does not filter out invalid certificates on a Windows XP SP2-based computer =

Article ID: 929477

Article Last Modified on 1/29/2007

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APPLIES TO


 * Microsoft Internet Explorer 6.0

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Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SYMPTOMS
You are using Microsoft Internet Explorer 6 on a Microsoft Windows XP Service Pack 2 (SP2)-based computer. When you connect to a Web site that uses a client certificate for user authentication, Internet Explorer does not filter out invalid certificates.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft Windows XP service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

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

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

After you apply this hotfix, the hotfix will remove the invalid certificates from the list of certificates that are displayed in the user interface.

Prerequisites
To install this hotfix, you must have Windows XP Service Pack 2 (SP2) installed on the computer.

Restart requirement
You must restart the computer after you apply this hotfix.

Registry information
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

After you install the hotfix, you have to modify registry settings to enable the hotfix. To do this, follow these steps:  Click Start, click Run, type regedit, and then click OK. Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_EXCLUDE_INVALID_CLIENT_CERT_KB929477

 On the Edit menu, point to New, and then click DWORD Value. Type iexplore.exe, and then press ENTER. Double-click iexplore.exe. In the Value data box, type 1, and then click OK. Exit Registry Editor.</li></ol>

Hotfix replacement information
This hotfix does not replace any other hotfixes.

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.

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

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MORE INFORMATION
For more information about standard terminology that is used to describe Microsoft software updates, 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: kbwinxpsp2fix kbhotfixserver kbqfe kbfix kbbug kbpubtypekc KB929477

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