So did you go to that site I suggested above. It's a simple test page to determine if you are blocked from port 6346 which is what LW uses.
I'm surprised they'd block dc. lol
Try the latest LW
Jum build 4.3.2 to see if it makes any difference. This is a beta program that's updated regularly. There's no installation. Just drag & drop it to wherever. But don't have both versions running at the same time.