Try this version of Java. Use the offline installer & remove your current Java version before you install this one.
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11

Try port forwarding for your router, the instructions are here.
Port Forwarding for the Actiontec GT701-WG
Don't forget the step of setting up a static IP address first. LW's listening port, port in the 'manual port forward' box & port forwarded within the router have to all be the same number.