Did you force ip within LW: Force IP instructions & sample image

What brand name & model number of modem do you have? Most high speed modems have internal firewalls. If we know these details then we can help you unblock those ports for you. If you're using p2p, advanced net games or video conferencing, you'd need to do the same thing ((but open more ports for those things.)

And make sure you have up to date java: Java 1.4.2 (click on link)