Occasionally and unpredictably, after playing any multiplayer Source game online and quitting, the game will refuse to connect to another server. If this happens, none of the multiplayer Source games I own will connect to any servers. Instead they sit there trying to connect and consistently fail after a certain amount of tries. Restarting my computer and un/replugging my ethernet do nothing, and everything else internetical functions just fine when this happens. I've had this problem since I got TF2 in December of 2009, and it occurs on different computers.I have no idea what could be causing this. As this is an extremely obnoxious problem currently preventing me from playing L4D2 with Skip and Kyzor, I would greatly appreciate some help.