If you want to completely disable FTP access on the DDP for security reasons, below is the procedure to follow:

Enter the following commands:
cp -p /etc/inetd.conf /etc/inetd.conf-`date +%b-%d-%Y`
ls -l /etc/inetd.conf*

You should see the following two entries:

-rw-r--r-- 1 root root 1461 Oct 26 14:05 /etc/inetd.conf
-rw-r--r-- 1 root root 1457 Feb 23 2007 /etc/inetd.conf-Oct-26-2017

Enter the following command:
sed -i '/ftp/s/^/# /' /etc/inetd.conf

And verify the modification was done:
more /etc/inetd.conf | grep -i ftp

You should see something similar to below:

# ftp stream tcp nowait root /usr/sbin/tcpd
/usr/sbin/in.ftpd
# #:boot: Tftp service is provided primarily for booting most sites.

Lastly, reboot the DDP for the change to take effect.
After the DDP has restarted, try to connect via FTP.

You should now get the following error message:
“ftp: connect: Connection refused”