Hello, I have exactly the reverse problem !
I'm on an iMacPro (witch is hosting the serveur and manager), I'm working also on this computer using Archicad to access the server (everything is working fine). I have a second laptop (PC) accessing the server from the LAN Network (inside the Office), but I can't access the server from outside. I'm not sure about the parameters in my LiveBox.
If you can help me configuring the TCP, UDP port...