enable user environment debug logging

enable user environment debug logging 

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon

Entry: UserEnvDebugLevel

Type: REG_DWORD 

NONE 0x00000000
NORMAL 0x00000001
VERBOSE 0x00000002
LOGFILE 0x00010000
DEBUGGER 0x00020000

The default value is NORMAL|LOGFILE (0x00010001).

Note To disable logging, select NONE (0x00000000).

You can combine these values. For example, you can combine VERBOSE 0x00000002 and LOGFILE 0x00010000 to get 0x00010002. Therefore, if UserEnvDebugLevel is given a value of 0x00010002, LOGFILE and VERBOSE are both turned on. Combining these values is the same as using an OR statement.

0x00010000 OR 0x00000002 = 0x00010002

Note If you set UserEnvDebugLevel to 0x00030002, the most verbose details are logged in the Userenv.log file.

%Systemroot%\Debug\UserMode\Userenv.log file. If the Userenv.log file is larger than 300 KB, the file is renamed Userenv.bak, and a new Userenv.log file is created.

you can set the read-only attribute on the Userenv.bak file, and the Userenv.log file will grow indefinitely.