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how to debug user logons – Windows 2003

Add the followign registry key

Subkey: HKEY_LOCAL_MACHINESoftwareMicrosoftWindows NTCurrentVersionWinlogon
Entry: UserEnvDebugLevel
Type: REG_DWORD
Value data: 10002 (Hexadecimal)
UserEnvDebugLevel can have the following values:
NONE 0x00000000
NORMAL 0x00000001
VERBOSE 0x00000002
LOGFILE 0x00010000
DEBUGGER 0x00020000

Saved to – %Systemroot%DebugUserModeUserenv.log

URL Reference: http://support.microsoft.com/kb/221833/en-us

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