21 is the actual port that FTP uses and 20 is the data port that the data connection is made through. I just set this up on my Barricade and it went smoothly. Just forward the two ports to your server's internal IP.
I'm using guildFTP as my FTP server. I don't know which program you're using, but if you're not opposed you might try that program. I know it works through a router.
Yeah, my router listens to any traffic through port 21 or 20 and then forwards it to the server as well. Maybe something's just not configured right in the server?
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