Rognol

Hi guys, I started playing 0a.d. a little while ago and it's fantastic. I'm having problems, though, when I want to host a game. I'm running the game in OSX Mavericks and I've tried port-forwarding to 20595 and letting upnp pass through my firewall. Why can't I host? Do the other people joining my game have to open their ports too? It always say "connection lost" Is it different from the lobby? I've tried hosting games there too and it doesn't work either. Could someone help me? I've been vrowsing the forum, but nothing I've seen seems to solve my problem. Thanks! -N