I am trying to figure out how to share files via magnet link while behind a firewall.

I sent a friend a magnet link containing my current IP address and left my computer running at that address. He cannot download the file shown in the link.

We are both behind a firewall and we are both using Limewire. He couldn't access my file via magnet link; however, we can both download from others and upload to users who find our files through a search.

Is this a port forwarding problem?

Here's an example of the magnet link:

magnet:?xt=urn:sha1:<hashgoeshere>&dn=myfile.pdf&x s=http://<MyExternalIP>:6346/uri-res/N2R?urn:sha1:<hashgoeshere>
Now, I'm thinking I may have screwed up here somewhere because in LimeWire, I went to Tools > Options > Advanced > Firewall Config, and noticed that my listening port was set to 6349 and the Manual Port Forward field was enabled and set to: 6346.

By the way...I'm using an AlphaShield firewall (not a router). Although, I'm not convinced that the AlphaShield has anything to do with my problem.

Any ideas, suggestions?