Thanks for the nmap scan output. It seems as though the FTP port is not being filtered, so iptables
shouldn't be a concern.
Originally Posted by andy106
how can I fixed this issue?
For starters I would suggest reading the man page and maybe googling around a bit. How
you plan to access the ftp server is important (and something you neglected to mention; either anonymously or via an actual user. You need to make sure they're not in /etc/ftpusers
Joey's ProFTPd Setup Guide