Your modem should be able to recognise UPnP technology. Go to LW's menu Tools>Options>Advanced>Firewalls & select listening port to 6346 & tick UPnP & press the Apply button. Then go back to menu File>Connect. Give it some time.
2. If that doesn't work, go back to LW's firewall settings, choose port 4915 instead. See how that goes.
If still not work get back to us. You might need to forward a port on your Speedstream.
Actually I'll give the instructions now just in case. 1st is very important to set up a static ip for this to work.
1. See
http://www.portforward.com/efficient/5200.htm for both setting up static ip 1st & then forwarding a port. Choose port 6346.
2.
Force IP instructions & sample image & 2 posts after that.