I'm one of the few that gets the "Unable to join host" error when trying to join a game.
I'm not going to ask for "help" per se as I can see there's a lot on this topic (and have tried everything I have read).
With that being said, does anyone here use a Apple Airport Extreme? Express? Time Capsule as their router? On the testing I can get the ports to pass (have tried multiple ports for the sake of testing). The one glaring difference is the "UPNP router" test fails. Which, from what I've read, shouldn't matter since the ports pass (as well as my link authentication).
Anyone else use an Apple "router" and get it to work?