I have a Mac and my OS is Leopard. I have tried numerous different Sites like Limewire and I get the same result. One green bar and a brickwall. I went into the firewall settings for my Mac and the "Allow all incoming " Could someone please help me with this.

Can you answer these questions for us please: System details - help us to help you (click on blue link)

BTW when you use LW, you don't connect to any site. You connect to other users of LW & other gnutella programs.