I use to run an ftp a long time ago using serv-u ftp software and a linksys router. First thing would be to check to see if your isp blocks you from having an active server on that port, I had to run mine on a port that was not blocked like port 7575, 8080..etc. Some isp's block port 21, 80 incoming so you can't host ftp's and websites. the changing the port is one, but it gets tricker to connect to.
As well if your connecting to an ftp server through a router, and the ftp is on a computer through a router then sometimes it will not work do to the port forwarding. It will work but sometimes the client that is trying to connect will have trouble logging in.
i know to get it to work on my system I had to set the router is static (internal) ips for each pc. then do the forwarding to that specific ip that the ftp server is on.
good luck hope you get it working!
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