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Cannot Use Shares with LMCompatibilityLevel set to Only NTLM 2 Authentication
Article ID: 236414
This article was previously published under Q236414
After you change the type of authentication to use only NTLM version 2, shares may not be accessible on other computers.
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 4.0To 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:
Windows NT Server 4.0, Terminal Server EditionTo 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:
(http://support.microsoft.com/kb/152734/EN-US/ )How to Obtain the Latest Windows NT 4.0 Service Pack
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.
For additional information about LMCompatibility settings, please click the article number below to view the article in the Microsoft Knowledge Base:
147706Because 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.
(http://support.microsoft.com/kb/147706/EN-US/ )How to Disable LM Authentication on Windows NT