Create a file called PPP.LOG in the% SYSTEMROOT%\SYSTEM32\RAS to help diagnose connectivity problems between a PPP server and client PPP when a computer is a client of Remote Access Service Windows NT.
Open your registry database and find the key below.
Create a new DWORD value or modify the existing value called 'Logging' using the settings below.
Quit the registry and restart or log out of Windows for the session so that the changes take effect.
System Key: SYSTEM\CurrentControlSet\Services\RasMan\PPP
Value: 1 standard logging
Value: 2 verbose logging
PPP logging is good but if you need more details use VPN logging.This may be useful if you are troubleshooting a problem with your VPN connection.
The log file is located in