My Airvpn will not connect when I´m online using the public wifi on the SJ trains in Sweden, anyone had the same problem? I´m using OpenVpn (Ios) I found this (https://kundo.se/org/sj/d/problem-med-vpn-pa-sj-tag/) (In swedish) Th MTU must be set to 1225 or lower, VPN software must be NAT-capable,Firewalls need to be open for GRE traffic and TCP traffic on port 1723.