Microsoft KB Archive/835208

= You cannot connect to your LDAP server with the Microsoft LDAP API over an SSL connection in Windows XP =

Article ID: 835208

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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SYMPTOMS
You may not be able to use the Microsoft LDAP API over an SSL connection to connect to your LDAP server. You may receive an event that is similar to the following event in the event log: Event Type: Error

Event Source: Schannel

Event ID: 36882

Description: The certificate received from the remote server was issued by an untrusted certificate authority. Because of this, none of the data contained in the certificate can be validated. The SSL connection request has failed. The attached data contains the server certificate.

When you try to use the LDAP_OPT_SERVER_CERTIFICATE option to define your own server certificate validation routine, you still cannot establish the connection.



CAUSE
This problem occurs because the certificate that the Lightweight Directory Access Protocol (LDAP) server sends is self-signed. When the Schannel.dll file tries to authenticate the certificate, it cannot find the certification authority (CA) certificate of the issuing CA in its Trusted Root Certification Authorities store. When you use an SSL connection, Schannel.dll tries to verify the certificate that is sent by the LDAP server even if you have used the LDAP_OPT_SERVER_CERTIFICATE option to define your own server certificate validation routine.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

Hotfix information
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 Windows XP service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product 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.

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 tool in Control Panel.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Microsoft Windows XP Service Pack 2.



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: kbhotfixserver kbqfe kbqfe kbwinxpsp2fix kbwinxppresp2fix kbfix kbbug KB835208

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