hi! i just found out if you are using voiplay, it can be hard to connect to the servers. if you shut it down you will be able to play! so if you got the same problem as i have, exit voiplay! i am using windows vista (home premium)
EDIT* you have to shut it down, you will have the same problem if you log out.
Seke3, it is because voiplay is using the easyanticheat system and almost all public severs have the valveanticheat system and you cant play with both at the same time (easy explane ^^)