Microsoft KB Archive/236414

= Cannot Use Shares with LMCompatibilityLevel set to Only NTLM 2 Authentication =

Article ID: 236414

Article Last Modified on 10/26/2007

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT 4.0 Service Pack 4
 * Microsoft Windows NT 4.0 Service Pack 5
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Workstation 4.0

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This article was previously published under Q236414



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.



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-


 * 152734 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/directory/overview.asp

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, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack



STATUS
Microsoft has confirmed that this is 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:

147706 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.

Keywords: kbproductlink kbhotfixserver kbqfe kbbug kbfix kbqfe KB236414

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