Microsoft KB Archive/185618

= Schannel.dll and Schnl128.dll Updates in Windows NT 4.0 SP4 =

Article ID: 185618

Article Last Modified on 6/23/2005

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APPLIES TO


 * Microsoft Internet Information Server 4.0

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This article was previously published under Q185618



We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/prodtech/IIS.mspx



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.

152734 : How to Obtain the Latest Windows NT 4.0 Service Pack

Keywords: kbinfo kbfea KB185618

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