DOCUMENT:Q207523 10-JAN-2001 [iis] TITLE :Error Occurs During SSL Connection PRODUCT :Internet Information Server PROD/VER:WINDOWS:4.0; winnt:4.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server 4.0 - Microsoft Internet Explorer Plus 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== When you attempt to connect to an IIS Web site using an SSL connection, one of the following symptoms occurs, depending on the browser being used: - In Internet Explorer, the following error message occurs: Internet Explorer could not open the Internet site: The data area passed to a system call is too small. - Netscape Communicator stops responding when you attempt to make the connection. CAUSE ===== The browser is trying to use a 128-bit session key, but the Web server is set up to use a 40-bit key. RESOLUTION ========== NOTE: Due to export restrictions, the 128-bit key strength encryption feature is available only in the United States and Canada. To resolve this problem, install the 128-bit version of the latest Windows NT 4.0 Service Pack (SP). This will enable the Web server to create 128-bit connections. Installing the 128-bit version of the Windows NT SP updates the Schannel.dll file, which is used by IIS to create SSL connections. MORE INFORMATION ================ For information about obtaining the latest Service Pack, go to the Windows NT Server Service Packs Web site at the following site: http://support.microsoft.com/Support/NTServer/Content/ServicePacks/ For more information about setting encryption strength, copy the following URL to your browser: http://localhost/iishelp/iis/htm/core/iistesc.htm For information on how to determine the security strength that IIS is using, see the following article in the Microsoft Knowledge Base: Q184311 Remote Key Request Generation Affected by Schannel.dll (c) Microsoft Corporation 2000, All Rights Reserved. Contributions by Kevin Zollman, Microsoft Corporation. Additional query words: schannel.dll 40 128 128bit 40bit security hangs freezes quits north america akz ====================================================================== Keywords : Technology : kbiisSearch kbIEsearch kbiis400 kbIEPlus400 Version : WINDOWS:4.0; winnt:4.0 Issue type : kbprb Solution Type : kbpending ============================================================================= 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.