Monster Hunter Freedom Unite (MHFU)

[bolverk]

Hello everybody, sorry for my bad english, i'm italian, i try to explain my problem. I and my friends want to play monster hunter freedom unite, we tried hamachi, tunngle and evolvehq but the problem persists. I enter in the game and go to the guild room, within this i can see my friends, but, after taking the mission, and my friends take it, i start the mission, and after the loading a messagge say "andrea leave the group" "lance leave the group" "mario leave the group" and i remain alone if someone else takes the mission, the result is the same! how do i fix it??? please help i'm desperate