Ummmm... could you start by telling us what the actual problem is?? Is your connection stuffed? Are you firewalled?
What??

You say you've done the things that the sticky suggests. What fixes have you tried. Is your firewall configured? Does your router support UPnP... if so, is it enabled within the device & ticked within LW? Does your router have a NAT firewall, have you tried port forwarding. What was the result of your port test?

A little bit of info would be really great. We can't read minds