Where are pptp logs?

Hello everyone
I trying to set up pptp vpn connection in openSUSE Leap 42.2, but I got an error ‘VPN connection failed’…
I can’t see nothing in dmesg and I have no /var/log/messages file

Where can I see pptp logs?

Open a terminal and execute the following the following

sudo journalctl -f |grep pptp

then try connecting and observe/capture the output.