"Failed to join game: No response from host" problem.

First off hello to every body since this is my first I would like to be courteous. I know this is a common problem that neither Steam not TW have truly addressed.
Any way I been playing E:TW for awhile when one day I started to get that error message. I play through a free WIFI that the city I live in offers, that is on 24/7, so there are no ports for me to open. And my firewall seems to be allowing the game to work fine. I also read about Hamachi and downloaded it but not sure how that helps. I would really appreciate any help you guys can give me, since I have a joins to play.