Monster hunter: Broke off group error

[Truman]

Hello there everyone, i have been trying to play multiplayer MHFU by normally enabling ad-hoc from the default coldbird.net
I haven't used Hamachi or anything else. All my psp settings are set to default. Like factory settings/fresh downloaded. I can see Players at the gathering hall. but whenever i go out on a quest with other players they get disconnected by saying "player broke off from the group"
Please, any help is appreciated ty :3