I am having trouble downloading music because LimeWire is showing I have a firewall. I don't use the Windows one, and I have the Norton one permitting Limewire. I guess this only leaves my Router. If I could get a set of instructions upon how to change it so that I can download again I'd be thrilled.

1. OS version? Windows XP
2. What firewalls you have? Windows - off, Norton - permitting Limewire
3. How much ram? 512 MB
4. Hard Disk space available? 130 GB
5. Connection type? Broadband
6. Modem & router brand name & model numbers? Router: D-Link, DSL-502T
7. Where are you trying to connect from (house, appartment complex, school, student accomodation, work, etc.)? House
8. What version of LimeWire (LW) & Java do you have? LW: 4.14.0, Java: 1.5.0_06
9. Who is your ISP (Internet Service Provider)? AAPT
10. 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? Your test worked!!
11. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up. No
12. Is this a your 1st try at LW or is this a new problem with an experienced user. New problem - experienced user
13. Do you see a brick wall in front of the blue world icon at the bottom of LW's interface? Yes
14. For those using a modem/router, how is your modem/router set up...are you port forwarding or is UPnP enabled? UPnP
15. What security programs are you using (antivirus etc)? Norton
16. What country are you living in? Australia

You could also try updating your Java. Use the JRE offline installer & remove your current Java version before you install this one.
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11

Here are the port forwarding instructions for your router.
Port Forwarding for the Dlink DSL-502T
Don't forget the step of setting up a static IP address first. LW's listening port, port in the 'manual port forward' box & port forwarded within the router all have to be the same number

You could try reconfiguring Norton's firewall.
http://www.gnutellaforums.com/226610-post6.html
PortForward.com - Free Help Setting up Your Router or Firewall

Were you able to download ok in the past? What's happening now when you try to download? Is it happening with every file or just some?

Haha, I updated Java and it's done the trick. I didn't even think to do that. It's still saying there is a firewall, but I'm content to leave it as it is as long as it continues to let me download music.

Thank you greatly for your reply. If it decides to play up again then I'll use the link to change the router.