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You cannot implement Lightweight Directory Access Protocol (LDAP) Secure Sockets Layer (SSL) client-side authentication on Windows 2000 because the callback that is defined in LDAP_OPT_CLIENT_CERTIFICATE is never called by the Windows 2000 version of Wldap32.dll.
The QUERYCLIENTCERT function is a client-side function that permits the server to request a certificate from the client when it is establishing an SSL connection.
The QUERYCLIENTCERT function does not make callbacks in the Windows 2000 version of Wldap32.dll.
The Microsoft Windows XP version of Wldap32.dll works correctly with QUERYCLIENTCERT calls.
Service Pack Information
To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
260910 How to Obtain the Latest Windows 2000 Service Pack
A supported hotfix is 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.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language. 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.