Since LW's default port is 'blocked' in your test (the port test you did failed), first of all you can simply try changing LW's listening port. If you didn't have port forwarding set up when LW was working, this is the easiest thing to try first. See the link I gave you for instructions about changing ports.

If that doesn't work, you can try port forwarding. Setting up the static IP isn't so hard, you just have to take your time going through the instructions
PortForward.com - Free Help Setting up Your Router or Firewall

Below are the port forwarding instructions for your router. Don't panic because it's referring to a Paradyne router... looks like your Zhone = Paradyne (Zhone 6211-I3 ADSL2+ CPE Router - bridge/router - Compare prices, reviews, user opinions - Shopper.com)

Port Forwarding for the Paradyne 6211-I3

Just remember - LW's listening port, port in LW's 'manual port forward' box & port forwarded within your router's setup pages must all be the same number