Microsoft KB Archive/288100

= Schannel Returns &quot;SEC_E_CERT_UNKNOWN&quot; for Valid Server Certificate =

Article ID: 288100

Article Last Modified on 2/28/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT 4.0 Service Pack 6a
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q288100



SYMPTOMS
An attempt to make a secure Lightweight Directory Access Protocol (LDAP) connection may not work and may return a &quot;SEC_E_CERT_UNKNOWN&quot; response when you are using a valid certificate. When this occurs, the Event log contains this entry:

Source : SChannel Event ID: 36876

The certificate received from the remote server has not validated correctly. The error code is 0x80090327. The SSL connection request has failed. The attached data contains the server certificate.



Windows 2000
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 2000 service pack 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 should have the following file attributes or later:   Date         Time   Size     File name -  06-Mar-2001  16:03  159,504  Instsch5.dll 06-Mar-2001 16:03  141,584  Schannel.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the following article number to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 hotfixes

Keywords: kbbug kbfix kbwin2000presp2fix kbqfe kbhotfixserver KB288100

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