Microsoft KB Archive/312035

= Authentication May Fail for Users Without a Windows NT Password Hash =

Article ID: 312035

Article Last Modified on 10/27/2006

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q312035



SYMPTOMS
When a user account only has an LM hash and not a Windows NT hash, authentication may fail as it would when a bad password is used. This happens only when the user's password was changed so that only the LM hash was updated. This problem only exists on Windows 2000 Service Pack 2 (SP2) and Windows NT 4.0 post Service Pack 6 (SP6) SRP, or one of these operating systems with certain hotfixes in place for the Advapi32.dll file.



CAUSE
This problem can occur when LogonUser is called.



Windows 2000
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English version of this fix should have the following file attributes or later:

  Date         Time   Version        Size     File name 13-Nov-2001 11:48  5.0.2195.4622  356,112  Advapi32.dll 13-Nov-2001 11:48  5.0.2195.4571   82,704  Cmnquery.dll 13-Nov-2001 11:48  5.0.2195.4534   41,744  Dsfolder.dll 13-Nov-2001 11:48  5.0.2195.4534  156,944  Dsquery.dll 13-Nov-2001 11:48  5.0.2195.4574  110,352  Dsuiext.dll

Windows NT 4.0 SP6a Computers with the SRP Installed
The English version of this fix should have the following file attributes or later:

  Date         Time   Version           Size     File name ---  05-Dec-2001  17:15  4.0.1381.7114     248,592  Advapi32.dll

NOTE: Due to file dependencies, this hotfix requires Microsoft Windows NT 4.0 Service Pack 6a.



WORKAROUND
To work around this problem, note that you can change the user's password from a Windows-based client to properly update the hashes.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3.



MORE INFORMATION
The hotfix that is described in this article updates the LogonUser function.

For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

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:

296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Additional query words:

Keywords: kbbug kbfix kbwin2000presp3fix kbqfe kbwin2000sp3fix kbenv kbsecurity kbhotfixserver KB312035

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