Parallels Virtualization and Automation Software

RESOLUTION

Please, check what superserver is used in the system. If you run xinetd you should create a configuration file for FTP service because by
default Plesk deb package configures proftpd with inetd.

--------- IMPORTANT INFORMATION FOR XINETD USERS ----------
The following line will be added to your /etc/inetd.conf file:

ftp stream tcp nowait root /usr/sbin/tcpd in.proftpd

If you are indeed using xinetd you will have to convert the above into the
/etc/xinetd.conf format and add it manually. See
/usr/share/doc/xinetd/README.Debian for more information.
----------------------------------------------------------

So, you should create /etc/xinetd.d/ftp_psa like:

service ftp
{
disable = no
socket_type = stream
protocol = tcp
wait = no
user = root
instances = UNLIMITED
server = /usr/sbin/in.proftpd
server_args = -c /etc/proftpd.conf
}

and restart xinetd with "/etc/init.d/xinetd restart". After that ftp should work.