The FTP port to be used for communicating with the FTP server (when running your project over the Internet). This parameter must be set (to the same value) on both the Internet Server and the Internet Display Client.
Although the standard FTP port is port 21, you can use any other port. However, no matter which port you choose, the port before it must also be available. For example, if you use port 3000, then port 2999 must also be available. Also, if you are using a firewall, you must ensure that both these ports are unblocked.
Allowable Values: 21 or 1024 to 10000
Default Value: 21