Chapter 10 Install and System Administration for FortiOS 5.0 : PPTP and L2TP : Logging VPN events
  
Logging VPN events
PPTP VPN, activity is logged when enabling VPN logging. The FortiGate unit connection events and tunnel status (up/down) are logged.
To log VPN events
1. Go to Log & Report > Log Config > Log Settings.
2. Enable the storage of log messages to one or more locations.
3. Select VPN activity event.
4. Select Apply.
To view event logs
1. Go to Log & Report > Event Log > VPN.
2. If the option is available from the Log Type list, select the log file from disk or memory.
See Also
FortiGate unit as a PPTP server
Configuring the FortiGate unit for PPTP VPN
Configuring the FortiGate unit for PPTP pass through
Testing PPTP VPN connections
Configuring L2TP VPNs
L2TP configuration overview
Adding the security policy