Like I said before, something's blocking LW's default port...could be your ISP. Who do you pay for your internet, is it Liberty Cablevision? I can't find any evidence that they block ports, but that's no guarantee that it's not what's happening. You could try some other ports in the range of 49152 - 65535.

Has your brick wall disappeared? Providing that your software firewall is configured properly, port forwarding should get rid of the brick wall icon. Just in case, try these instructions. Remember, LW's listening port, port in the 'manual port forward' box & port forwarded within a router all have to be the same number. And don't forget to set up a static IP address first.
Port Forwarding for the Belkin F5D7230-4

Do you know anyone, in the same local area with the same ISP, that can use LW without a problem? If it is your ISP at fault, there's probably not much you can do.