My network...
 

Why my jazz2 throw me out in to the partymode net game? Jazz version is 1.23 (sorry my english. I live in Finland :) )

Do you know Swedish?;P Some fins tend to do that^^
Maybe you were kicked or banned? I often host public servers for 2vs2s and 3vs3s... So I might have kicked you. Also, I saw you in my server today, and I closed it, if that could have been what you meant;P

(actually, swedish is our second language, but we know a (-) about it)

might be that you suck playing, and you don't know what is wallclimbing, so they kick you out

He obviously means that he gets thrown out after 30 seconds because of a time out. Check this.

Yeah, I think you're having connection problems. Open the right ports in your firewall and you'll be just fine. I have a router, and by forwarding the correct ports I am able to host games as well as join them. Check the article that Sers posted for more information.