RE: STOP c000021a Windows logon service failed

From: Bill Peele [MS] (
Date: 03/02/04

Date: Tue, 02 Mar 2004 19:53:38 GMT

>From: "Ben" <>
>Subject: STOP c000021a Windows logon service failed
>Date: Tue, 3 Feb 2004 09:41:49 -0800
>Newsgroups: microsoft.public.win2000.general
>I have one of my machines at here giving me a start up
>error... then the machine will just reboot. I looked it
>up in knowledgebase, and it says the latest service pack
>fixes the issue... I have the latest on there... and even
>if I didn't, I can't get the machine to boot in any mode
>without giving this error, and rebooting again.
>Stop c000021a (fatal system error)
>Windows logon service system service failed unexpectedly
>with status of 0x00000080 (0x00000000 0x00000000)
>Anyone ever deal with this, and not have to rebuild the

The STOP 0xC000021A error occurs when either Winlogon.exe or Csrss.exe fails. When the Windows NT kernel detects 
that either of these processes has stopped, it stops the system and raises the STOP 0xC000021A error.
Most STOP 0xC000021A errors occur because Winlogon.exe fails, which typically occurs because of a faulty third-party 
Graphical Identification and Authentication (GINA) DLL. The GINA is a replaceable DLL component that Winlogon.exe 
loads. The GINA implements the authentication policy of the interactive logon model. The GINA performs all identification 
and authentication user interactions. 
It is very common for certain types of remote control software to replace the default Windows GINA DLL (Msgina.dll). 
Therefore, a good first step is to examine the system to see if it has a third-party GINA DLL. To do this, locate the following 
registry key:
	HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
	Value = GinaDLL REG_SZ
- If the Gina DLL value is present and is anything other than 
  Msgina.dll, this probably means that a third-party product has changed 
  this value.
- If this value is not present, the system uses Msgina.dll as the 
  default GINA DLL
Bill Peele
Microsoft Enterprise Support
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