It's a B...not an 8, at the start of your model number

Try port forwarding & use these instructions
http://www.portforward.com/english/r...d/Limewire.htm

Somebody else with that model used those instructions to port forward & it worked fine. Just remember to set up a static IP address first (very important), you'll find instructions in that link.
The port number forwarded, LW's listening port & any specific port numbers allowed thru a software firewall must all be the same number!!

That should get rid of the firewall icon. If you still can't connect after that, it could be an ISP issue (but I can't find any evidence that CenturyTel block p2p).