port
The port setting configures which TCP/IP port number NcFTPd
listens on. The default is port 21, which is the standard FTP control
connection port number. The server also requires that it can use
the port numbered one less, for the data connection. Again, with
a standard setup, that would mean that NcFTPd uses port 21 and port
20.
Using a non-standard port number is not very useful. It can be
helpful when you want to run multiple FTP services, but with NcFTPd
you should be able to do everything you want on the standard port number.
Examples:
port=21
port=321
port=5021
Recommendation: