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Q290406: Stop 0xC000021A with Custom Gina.dll & WLX_LOGON_OPT_NO_PROFILE

Article: Q290406
Product(s): Microsoft Windows NT
Version(s): 4.0
Operating System(s): 
Keyword(s): kbenv kberrmsg kbfile kbWinNT400PreSP7Fix
Last Modified: 08-MAY-2002

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The information in this article applies to:

- Microsoft Windows NT Server version 4.0 
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SYMPTOMS
========

When you use a custom Gina.dll file with the WLX_LOGON_OPT_NO_PROFILE flag, you
may receive the following error message on a blue screen:

  Stop 0xC000021A (0xfcf67fe8, 0xc0000034, 0x00000000, 0x00000000)

CAUSE
=====

This problem occurs because Winlogon is referencing a pointer that is not valid.

RESOLUTION
==========

A supported fix is now available from Microsoft, but it is only intended to
correct the problem described in this article and should be applied only to
systems experiencing this specific problem. This fix may receive additional
testing at a later time, to further ensure product quality. Therefore, if you
are not severely affected by this problem, Microsoft recommends that you wait
for the next Windows NT 4.0 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services
to obtain the fix. For a complete list of Microsoft Product Support Services
phone numbers and information about support costs, please go to the following
address on the World Wide Web:

  http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal support costs will apply to additional
support questions and issues that do not qualify for the specific update in
question.

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

  Date        Time    Size     File name     
  -----------------------------------------
  03/01/2001  04:20p  343,312  Rpcrt4.dll
  03/01/2001  08:27p  192,784  Winlogon.exe

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



WORKAROUND
==========

To work around this problem, do not use the WLX_LOGON_OPT_NO_PROFILE flag in
your custom Gina.dll file.

STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft products that are
listed at the beginning of this article.

MORE INFORMATION
================

For more information about the WLX_LOGON_OPT_NO_PROFILE flag, search the MSDN
Web site:

  http://msdn.microsoft.com/default.asp


Additional query words: dr watson

======================================================================
Keywords          : kbenv kberrmsg kbfile kbWinNT400PreSP7Fix 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400
Version           : :4.0
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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