In order for the multiplayer sessions to work correctly, make sure the official Steam ports are unlocked, please. You can find the ports here: Steam: htt...

Yes, you can. You will lose progress for that specific match, though.

Yes, you can, but only in the Casual mode.

No, you can't :(

No, you can't. If you die during a match, other players can pick up your unique weapons along with their skins and use them as long as that match lasts....