See Log Messages for Mobile VPN with IPSec

You can use the Mobile VPN client log file to troubleshoot problems with the IPSec VPN client connection.

To view Mobile VPN log messages in the macOS VPN client, select Log > Logbook from the WatchGuard Mobile VPN client.
The Log Book dialog box opens.

To view Mobile VPN log messages in the Windows VPN client , select Help > Logbook from the WatchGuard Mobile VPN Monitor.
The Log Book dialog box opens.

Screen shot of the Logbook dialog box