Sometimes... Idk for A28, but in older releases it sometimes worked when I restart/re-login/re-host. I see there's no "STUN" option anymore, too?
Idk how Starcraft 1 / Bnet and ShieldBattery works perfectly and not 0AD.
Whenever I host, someone types "bete i can't join"...
Idk how many people have this issues but this is priority #2 (lag/game performance when higher population is reached - is priority #1).
I'll just close 0AD and play other RTS now.