Do this test, does it work?
http://www3.limewire.com:6346

Do you see the firewall icon (brick wall)?

Who is your ISP & what's the model of your DLink? Have you used LW or other p2p apps before?

Read through this
Connection problems? Check here first!
You're better off to have a firewall configured for LW rather than turned off. You'll find a link for firewall setup within that thread.