DOCUMENT:Q185618  24-JUL-2001  [iis]
TITLE   :Schannel.dll and Schnl128.dll Updates in Windows NT 4.0 SP4
PRODUCT :Internet Information Server
PROD/VER:WINNT:4.0
OPER/SYS:
KEYWORDS:kbFEA kbWinNT400sp4fea

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Internet Information Server 4.0 
-------------------------------------------------------------------------------

SUMMARY
=======

The new Schannel.dll and Schnl128.dll files in Windows NT 4.0 Service Pack 4
have been modified to address the issues listed below.

MORE INFORMATION
================

The changes made to the above listed files include:

 - Cache access has been unserialized to improve performance on the server side.

 - The cache automatically grows itself, for improved memory usage. (the server
   had been blocking connections under heavy load).

 - DES, 3DES, and DHE ciphers have been added (for compatibility with other
   implementations).

 - Fortezza has been added (a government cipher).

 - New APIs were added to the SSPI interface.

 - RPC fixes were made. Some bugs were fixed, allowing connection mode usage of
   schannel.

To obtain the latest service pack for Windows NT version 4.0, please see the
following article in the Microsoft Knowledge Base.

   Q152734 : How to Obtain the Latest Windows NT 4.0 Service Pack


======================================================================
Keywords          : kbFEA kbWinNT400sp4fea 
Technology        : kbiisSearch kbiis400
Version           : WINNT:4.0
Issue type        : kbinfo

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 2001.