The connection issues I was talking about should happen in the first 4 min. and I'd expect if 2 players recognize this to just abort the game on equal terms. More frustrating its at >8 min. I also like the way lichess handles it. Its server hosted, but apart from that, if one player disconnects, a timer counts down "1:30" and if its run out, the remaining player has the option to claim a victory or draw. He also has the normal resignation option. For 0 A.D. if one player drops, and the remaining player is fair, I'd like some options, like claim victory, resign, abort (draw), spoil scores for a better decision or choose decide by score (blind without knowledge of it).

Ok, maybe my statement was a bit biased. But still, other games usually count connection issues in rated matches as your fault too, no?

Cool!

Indeed! Thank you very much

@Itmsthank you for your reply. I tried qbittorrent and transmission on macOS. I explicitly open the IPv6 port on my router (only reachable over IPv6 on the internet, but have dual stack at home), Transmission says the port is open, but it looks like nothing seems to be going out. I am seeing some pairs trying to connect, so I guess this is not a problem from the tracker neither. Thank you anyway!