You're aware aren't you that wireless connection devices have their own firewalls (NAT.) You need to find if yours supports UPnP (Universal Plug & Play.) See that section here Connection problems? Check here first! (click on link)

Do a port test: 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?

Who is your ISP by the way? If you suddenly can't connect, they might be responsible for it.