Double-check your port forward settings. See Port Forwarding for the Speedstream 5200 instructions here & make sure you set up a static ip first!!! Very important otherwise your settings will change everytime you log on (ie: the modem will assign your comp a new no. each time.) Also make sure you added the Force IP within LW: Force IP instructions & sample image & ensure you used the same port no. for both LW's port & firewall setting, & your speedstream. When you've adjusted your modem for port forwarding, don't forget to save your settings & reboot the modem.

Update your Java to Java 1.5 (take the JRE)