OpenVPN log location

In Turris 3.6, easy OpenVPN configuration is available. Having it configured according to the guide but client connection failed (no response). I could not find OpenVPN server log files or Turris. Could anyone help where to find it (or, if not activated by default, how to activated logging). Hardware is Turris 1.
Thanks

You can usually find them in /var/log/messages.

Helas, this is one of locations where I did not find anything.