just for the moment, you could try to set ur nic to have a static ip like say 192.168.1.100, then in router gui, set 192.168.1.100 in ur dmz(demilitarized zone) that leaves you compleatly open and un protected though. then try to connect, if it works, then its router firewall. if not its something else. possibly software firewall? dont forget to remove yourself from the dmz when you are done.