Pressing CTRL+ALT+DEL When Logging On Can Cause Blue Screen (163874)
The information in this article applies to:
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Server 4.0
This article was previously published under Q163874 SYMPTOMS
If Client Services for NetWare (CSNW) is installed and a user presses the
CTRL+ALT+DEL key sequence immediately after entering his or her password at
the logon prompt, the system halts with a C000021A STOP code.
CAUSE
It is by design within Windows NT that, if the Secure Attention Sequence
(SAS) (CTRL+ALT+DEL) is pressed, any logon scripts currently running are
terminated. This gives the user the ability to easily kill any logon
scripts that may have stopped responding. However, if this sequence is
pressed before a process running a logon script has started running
properly, a blue screen STOP error can result. This error is caused because
Winlogon.exe performs an access violation.
NOTE: The user does not have to have a logon script defined for this
problem to occur. With CSNW, the logon script processor is responsible for
checking to see if a logon script is actually available to run and,
therefore, is started even if no script is defined.
RESOLUTION
There is a fix available from Microsoft Technical Support that fixes this
problem.
STATUS
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.
Service
Pack. For information on obtaining the service pack, query on the following
word
in the Microsoft Knowledge Base (without the spaces):
| Modification Type: | Major | Last Reviewed: | 8/9/2001 |
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| Keywords: | kbbug KB163874 |
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