DOCUMENT:Q187493  09-AUG-2001  [winnt]
TITLE   :Some Netscape Client Certificates Rejected by IIS
PRODUCT :Microsoft Windows NT
PROD/VER:WinNT:4.0
OPER/SYS:
KEYWORDS:kbWinNT400sp4fix

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The information in this article applies to:

 - Microsoft Internet Information Server 4.0 
 - Microsoft Windows NT Server version 4.0, Terminal Server Edition 
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SYMPTOMS
========

On some Netscape client certificates, Internet Information Server (IIS) may
return the following message:

   HTTP/1.1 403 Access Forbidden, This Virtual Directory requires a browser
   that supports the configured encryption options.

NOTE: Other certificates from Netscape clients work fine.

CAUSE
=====

IIS will sometime detect a certificate that is verifiable as unverified, but
does not cause an unverifiable certificate to be verified.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or
Windows NT Server 4.0, Terminal Server Edition. For additional information,
please see the following article in the Microsoft Knowledge Base:

   Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack


STATUS
======

Microsoft has confirmed this to be a problem in Internet Information Server
version 4.0. This problem was first corrected in Windows NT 4.0 Service Pack 4.0
and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.


Additional query words: Verisign client certificates ca SSL

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Keywords          : kbWinNT400sp4fix 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbNTTermServ400 kbNTTermServSearch kbiisSearch kbiis400
Version           : WinNT:4.0
Issue type        : kbbug
Solution Type     : kbfix

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