Hello,

The service pptp has himself configured the incoming firewall, port 1723 and I suppose protocol 47 (GRE+PPTP) is open.

I can't use openvpn, I know it's better... but I have a fleet of 100 mobiles devices that use integrated pptp connection... (no time to reconfigure all and I can't ask to finals users to do it themself... they don't understand what I talk, it's only school teatchers ) I always use until now Synology pptp server or Draytek pptp server without problem.

I test a clearOS as a possible alternative in the futur...