DOCUMENT:Q322051 03-JUN-2002 [winnt] TITLE :Programs May Not Connect to Server with Mismatched Security DLLs PRODUCT :Microsoft Windows NT PROD/VER::4.0,4.0 SP6a OPER/SYS: KEYWORDS:kbWinNT400nospFix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server versions 4.0, 4.0 SP6a ------------------------------------------------------------------------------- SYMPTOMS ======== After you install the Microsoft Windows 2000 Security Rollup Package (SRP) or you use NTLM version 2 to connect to a Windows NT 4.0-based server with the SRP installed, your programs may not connect to the server. CAUSE ===== Installing the SRP on Windows NT 4.0 with the 56-bit version of Service Pack 6a (SP6a) and Microsoft Internet Explorer 6 can cause the following mismatched dynamic-link libraries (DLLs) to be installed: Schannel.dll Ntlmssps.dll This causes the Windows NT 4.0-based server to negotiate a 128-bit connection. However, the 56-bit security DLLs cannot decrypt the packets. The Windows 2000 SRP forces NTLM version 2 connections with the Windows NT 4.0-based server. RESOLUTION ========== A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems 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 on support costs, please go to the following address on the World Wide Web: http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS NOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal 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 has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. Date Time Size File name Platform -------------------------------------------------------- 16-Jul-2001 12:05 36,112 Ntlmssps.dll I386 - 128-bit 23-Sep-1999 11:04 59,152 Security.dll I386 - 128-bit 16-Jul-2001 12:05 36,112 Ntlmssps.dll I386 - 56-bit 18-Nov-1999 12:04 59,152 Security.dll I386 - 56-bit NOTE: Because of file dependencies, this hotfix requires Microsoft Windows NT 4.0 Service Pack 6a. WORKAROUND ========== To work around this problem, install the hotfix that is mentioned in the "Resolution" section. This upgrades the computer to 128-bit security. If you must use the 56-bit versions of the DLLs in Windows NT 4.0, you can manually replace the Schannel.dll and Ntlmssps.dll files with the 56-bit versions from the SRP: 1. Extract the files from the SRP. Use this command "q299444i -x". 2. Rename the current Schannel.dll and Ntlmssps.dll files in the %SystemRoot%\System32 folder. 3. Copy the SRP versions of the Schannel.dll and Ntlmssps.dll files to the %SystemRoot%\System32 folder. STATUS ====== Microsoft has confirmed this to be a problem in the Microsoft products that are listed at the beginning of this article. MORE INFORMATION ================ This problem may occur with Microsoft Exchange 5.5 administrative programs connecting to Exchange 5.5-based servers. This causes the following error message: DS_E_COMMUNICATION_PROBLEMS For additional information, click the article number below to view the article in the Microsoft Knowledge Base: Q311401 Windows 2000 Security Rollup Package 1 (SRP1), January 2002 For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base: Q296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot Additional query words: ====================================================================== Keywords : kbWinNT400nospFix Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400sp6 kbWinNTS400search kbWinNTS400 Version : :4.0,4.0 SP6a Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbfix ============================================================================= 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 2002.