im play loads of mp games online with out any probs.
so i have just started to play mp on thehunter and most servers it just comes up with Something went wrong when creating your game session.
my internet is fine send and receive packets just fine.
i tried 7 servers today and got into 3 of them with out any probs ?
Playing loads of multiplayer games doesn't really prove anything. Just that those games work fine and this one doesn't. There are far more variables you'd need to eliminate before the developers would consider the issue to be on this end. I've played theHunter from a connection provided by the same ISP as you, so it's most likely not the ISP doing anything to affect this type of traffic. With a bit of fiddling we could most likely resolve your issue. The first thing would be to forwarded UDP traffic on port 32303 to your computer's IP address.
If you want to PM me with your router model I can probably tell you exactly what to do to fix the issue.