This article was previously published under Q163874
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If Client Services for NetWare (CSNW) is installed and a user presses theCTRL+ALT+DEL key sequence immediately after entering his or her password atthe logon prompt, the system halts with a C000021A STOP code.
It is by design within Windows NT that, if the Secure Attention Sequence(SAS) (CTRL+ALT+DEL) is pressed, any logon scripts currently running areterminated. This gives the user the ability to easily kill any logonscripts that may have stopped responding. However, if this sequence ispressed before a process running a logon script has started runningproperly, a blue screen STOP error can result. This error is caused becauseWinlogon.exe performs an access violation.
NOTE: The user does not have to have a logon script defined for thisproblem to occur. With CSNW, the logon script processor is responsible forchecking to see if a logon script is actually available to run and,therefore, is started even if no script is defined.
There is a fix available from Microsoft Technical Support that fixes thisproblem.
Microsoft has confirmed this to be a problem in Windows NT version 4.0.This problem was corrected in the latest Microsoft Windows NT 4.0 U.S.ServicePack. For information on obtaining the service pack, query on the followingwordin the Microsoft Knowledge Base (without the spaces):