Making the secure FTP port is more important as you already know that vsftpd use default port 21 for making the connection with the server. So anybody (hacker) can try with the same port for connecting to the server. But what if he/she doesn’t know the port for vsftpd for connection. Yes, there is a way to make secure FTP port.
Step 1: Edit the /etc/vsftpd/ vsftpd.conf file using vi editor to change the secure ftp port using “listen_port” entry.
vi /etc/vsftpd/vsftpd.conf
Add/modify below entry:
listen_port=201
Step 2. Once you changed the secure FTP port restart the service.
#service vsftpd restart
Shutting down vsftpd: [ OK ]
Starting vsftpd for vsftpd: [ OK ]