Proftpd connections:
ftptop – show current connections in realtime in a ‘top’ like format
ftpwho – list current connections
Restart Proftpd (Parallels Plesk/Cent OS):
/etc/init.d/xinetd restart
Active vs Passive FTP:
A good article on this subject can be found here.
MS-DOS Ftp command Passive Mode:
To set passive mode type:
quote pasv