One thing to try: Fire up a packet sniffer, launch your FTP client, and connect to your server in Toronto. Wait until it times out and then go look for traffic going back and forth between the two machines. One thing (if it'd been all FTP servers and just FTP) would be whether it was set to active or passive mode, but if you say you can access other servers, that's a little bit puzzling.
Have you always had this issue, or done anything recently to cause it?
One thing to test: Remove 2 of the machines from your network and set up the remaining one as the "only" system that the router knows about, making the router transparent to the setup (ie: forward everything straight to that machine).
If it works, you know that you've got a configuration issue in your router.
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