FIX: SetClientCertificate May Not Select the Correct Client Certificate (323035)


The information in this article applies to:

  • Microsoft Windows HTTP Services (WinHTTP) 5.0, when used with:
    • the operating system: Microsoft Windows 2000 SP1
    • the operating system: Microsoft Windows 2000 SP2
    • the operating system: Microsoft Windows XP
This article was previously published under Q323035

SYMPTOMS

The WinHTTP SetClientCertificate application programming interface (API) can be used to select a client certificate for secure communication. If you have two client certificates installed and the subject name of the first certificate is the prefix of the subject name of the second certificate, SetClientCertificate may return the second certificate when you try to select the first certificate, and the secure communication may be unsuccessful.

CAUSE

WinHTTP does a substring comparison on the subject name to select the client certificate and returns the first match.

RESOLUTION

A supported hotfix is now available from Microsoft, but it is only intended to correct 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 version that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone 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 typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix has the file attributes (or later) 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 tool in Control Panel.
   Date         Time   Version        Size     File name
   -------------------------------------------------------
   07-May-2002  20:53  5.0.2613.1001  292,864  WinHttp5.dll

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
Modification Type:MinorLast Reviewed:10/11/2005
Keywords:kbHotfixServer kbQFE kbbug kbfix kbQFE KB323035
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