Microsoft KB Archive/189291

= Hang in Winlogon on Workstation Locked Dialog Box =

Article ID: 189291

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Platform Software Development Kit-January 2000 Edition

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This article was previously published under Q189291



SYMPTOMS
A Windows NT computer may appear to stop responding (hang) in the Workstation Locked dialog box, but you will still be able to move the mouse and access the computer from the network.



CAUSE
This problem can occur when running a filter Gina.dll. This problem is caused by a race condition in Winlogon wherein Secure Attention Sequence (SAS) messages are disabled and not reenabled.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or 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 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.



MORE INFORMATION
A race condition resulting in a computer that quits responding exists in Winlogon if a custom Gina.dll's WlxLoggedOnSas function immediately returns with WLX_SAS_ACTION_LOCK_WKSTA.

Additional query words: SDK

Keywords: kbhotfixserver kbqfe kbbug kbfix KB189291

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