Microsoft KB Archive/282935

= CRL Chasing Does Not Work on Windows NT 4.0 =

Article ID: 282935

Article Last Modified on 10/27/2006

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APPLIES TO


 * Microsoft Internet Explorer 5.5 Service Pack 1
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.0
 * Microsoft Outlook 2000 Standard Edition

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This article was previously published under Q282935



SYMPTOMS
When you are using Outlook 2000 on a Microsoft Windows NT 4.0 client to check a certificate that was issued by an LDAP certificate authority, you may receive the following error message:

The Certificate Revocation List needed to verify the signing certificate is either unavailable or has expired.

Note that you may receive this error message even if the certificate is valid.



CAUSE
This is caused by the inability of Windows NT 4.0 to issue an LDAP version 3 BindRequest.



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, 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/default.aspx?scid=fh;EN-US;CNTACTMS

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 fix should have the following file attributes or later:

 Version          File name - 5.131.1877.9     Cryptnet.dll NOTE: Due to file dependencies, this hotfix requires Microsoft Windows NT 4.0 Service Pack 6a.



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0.



MORE INFORMATION
In a network trace you can see an LDAP ProtocolOp where the client issues a version 2 BindRequest and the server responds with Result Code = No Such Object. This continues until the client times out and then Outlook returns the error message.

Keywords: kbbug kbfix kbqfe kbhotfixserver KB282935

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