DOCUMENT:Q236414 20-MAY-2002 [winnt] TITLE :Cannot Use Shares with LMCompatibilityLevel set to Only NTLM 2 PRODUCT :Microsoft Windows NT PROD/VER:winnt:4.0 SP4,4.0 SP5 OPER/SYS: KEYWORDS:kbWinNT4sp6fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0, Terminal Server Edition - Microsoft Windows NT Server versions 4.0 SP4, 4.0 SP5 - Microsoft Windows NT Workstation versions 4.0 SP4, 4.0 SP5 ------------------------------------------------------------------------------- SYMPTOMS ======== After you change the type of authentication to use only NTLM version 2, shares may not be accessible on other computers. CAUSE ===== Starting in Windows NT 4.0 Service Pack 4 (SP4), Microsoft provided an enhancement to control the type of security used for authentication using NTLMSSP. A new registry key named LMCompatibilityLevel was added. With the key set to "Allow only NTLMv2", the local RDR does not succeed in getting credentials. RESOLUTION ========== Windows NT Server or Workstation 4.0 ------------------------------------ To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to: - http://www.microsoft.com/windows/servicepacks/ -or- - Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack For information on obtaining the individual software update, contact Microsoft Product Support Services. 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 Windows NT Server 4.0, Terminal Server Edition ---------------------------------------------- To resolve this problem, obtain the latest service pack for 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 Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT Server 4.0 Service Pack 6 and Windows NT Server 4.0, Terminal Server Edition Service Pack 6. MORE INFORMATION ================ For additional information about LMCompatibility settings, please click the article number below to view the article in the Microsoft Knowledge Base: Q147706 How to Disable LM Authentication on Windows NT Because of the increased security level, the NET USE command may not work when the domain is defaulted. This is because the defaulted or non-existent domain is rejected at this security level. For this command to work the domain name must be supplied. Additional query words: ====================================================================== Keywords : kbWinNT4sp6fix Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400search kbWinNT400search kbWinNTW400sp5 kbWinNTW400sp4 kbWinNTSsearch kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400search kbNTTermServ400 kbNTTermServSearch Version : winnt:4.0 SP4,4.0 SP5 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.