MHFU - Can't play with more than 2 players

[tywald]

Have you tried have someone else pick up the quest? For some people, disabling anti-virus has helped(maybe it has a built-in firewall). Pretty recently in our Evolve party had a similar problem but after disabling McAfee it worked.

You don't need to do the 25% speed trick anymore since v0.9.8-890-g1445d5a.

It's usually either:
1) Fast Memory not turned off for someone(however you said everyone did right?).
2) Firewall isn't configured properly or turned off(easiest solution) - or other 3rd party programs that can block incoming and outgoing connections, preventing you to host.