You will need to forward a port for your D-Link, see here:
Port Forwarding for the Dlink DI-524 & you should use
Port 6346 Make sure you set up a Static IP, instructions in link at start of that page.
You will also need to Force IP within LW (which is the easy part):
Force IP instructions & sample image
Update your Java:
Java 1.4.2 (click on link)