Multiplayer android game works only on LAN

Hi,

I have a pretty common issue, apparently, but not that easy to solve. I'm making a multiplayer game for android, but I can't make it work on the internet. When I try with my tablet and my phone which are on the same network, it works ; but if I connect the phone via 3G/4G, or with an other box, they can only join the room then they don't see each other and they can't communicate anymore.

Does someone have an idea to solve this very annoying issue?

might be related to my problem, take a look here and feel free to ask away: https://www.scirra.com/forum/viewtopic.php?f=147&t=178631

yep ! it seems to be the same problem, but I wanted to make my game work without external server. It's really a small game that i don't plan to publish on playstore, then I don't want to run a server for this...

well so if it is only for testing purpose you can have an account on my turn server

so who will actually play this game?

actually, I created this game just for me and a friend, the graphics are horrible, I made it just because we liked a game with the exact same mechanics but doesn't support online multiplayer :p So I made it multiplayer but it don't work --'

Ok ! cool What do I have to do?

I send you a privatemessage with your credentials