Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What happens when you go there?

Did you check to ensure UPnP is enabled on your router? Linksys UPnP setting (click on link)

Depending on your linksys model, it might be worth manual port forwarding it. You'll find your model here http://portforward.com/routers.htm

If you have 2 software firewalls on your computer, then disable one. Having to active ones does not improve security, it has the opposite effect. And can also affect other net programs. Configure your firewall as described here Firewall configuration instructions (click on link)