I have forwarded a few ports, 990, 3850, and 21.
If you intend to make the server public eventually, you need to forward multiple ports for Passive data connections. For low-traffic FTP servers 100 ports should suffice, higher traffic ones need thousands.
If the server works from the same PC, the server works. The rest is all about firewall/router exceptions and the like.
If I try to connect to 127.0.0.1 I get this
Whatever PC you tried this IPv4 on must run an FTP server, too. That address always means ''Connect to yourself''.
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