You need to read the sticky in the Connection Problems section. The first part "... check here first" has lots of info & advice about how to set up. Make sure your firewall's configured properly & don't run 2 firewalls at once. Do the port test & see what result you get.

Many firewall probs are due to internal firewalls within modems/routers. Read all the info about this & find out if your device has an internal firewall. Same for UPnP... find out if your router supports it & make sure it's enabled within the device & ticked within LW's firewall config.