I have a theory that you may want to try:
Contact your ISP and/or get into your router if you have one and make sure the following ports are properly forwarded:
30841 (Game server)
30844 (Client for pvp matches.)
IF any programs you have installed use these ports there will be a conflict if both programs are running at the same time, try end tasking that program and then see if logs in. We have not changed the ports so the problem is most likely and regrettably inconveniently on your system's side, unless this is happening to a lot of people but it looks to be extremely rare and only you so far, if my theory is correct and you find a program that is conflicting the ports please post what program that is for future reference.
Sorry for the inconvenience.
Joseph B. Visscher - JBV3737
Bugs aren't the problem, figuring out how to fix them is.