Access Violation in Winlogon with Third-Party Gina.dll

• Microsoft Windows NT Workstation version 4.0 with Service Pack 3
• Microsoft Windows NT Server version 4.0 with Service Pack 3
• Microsoft Windows NT Server Enterprise Edition version 4.0

SYMPTOMS

When you attempt to run the screen saver after a period of inactivity, Winlogon.exe encounters an access violation, and a STOP 0xC000021A message appears on the screen.

CAUSE

This problem only occurs if a third-party Gina.dll file is installed on your computer and if the updated GINA, or any of the libraries with which it is linked, performs window hooking.

RESOLUTION

To resolve this problem, obtain the following fix or wait for the next Windows NT service pack.

This fix should have the following time stamp:

   01/28/98  20:05               169,744 Gdi32.dll  (Intel version)
   01/22/98  20:50                47,392 User.exe   (Intel version)
   01/28/98  20:05               323,344 User32.dll (Intel version)
   02/03/98  20:11             1,237,520 Win32k.sys (Intel version)
   01/28/98  20:05               175,376 Winsrv.dll (Intel version)

   01/28/98  20:02               307,984 Gdi32.dl   (Alpha version)
   02/05/98  21:51                42,464 User.exe   (Alpha version)
   01/28/98  20:02               579,856 User32.dl  (Alpha version)
   02/03/98  20:08             2,050,608 Win32k.sys (Alpha version)
   01/28/98  20:02               316,176 Winsrv.dll (Alpha version)

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 4.0. A supported fix is now available, but has not been fully regression tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.