FTP uses transmission control protocol (TCP) for transport needs. Since FTP uses two channels, it requires two ports, one for the data channel (port 20) and one for the control channel (port 21).
FTP requires two communication channels to work: a control channel (also known as command channel) and a data channel. 
Go through the wizard that appears and select “Choose a custom network location”. Right-click in the right pane and select “Add a network location”.
To connect to an FTP server, open a File Explorer or Windows Explorer window, click the “This PC” or “Computer”. The Data Connection Port 20 is the most commonly used data connection port for FTP Port 989 is the accepted default data connection port for FTPS. The server replies, indicating which (random) port it has opened for data transfer.To connect to an FTP server, open a File Explorer or Windows Explorer window, click the “This PC” or “Computer”. Here's how passive mode works in a nutshell: The client connects from a random port to port 21 on the server and issues the PASV command. – user3293 at 15:33When the FTP server replies, it indicates what port number it has opened for the ensuing data transfer. FTPS is FTP with SSL, FTPS starts a new DATA connection on a new random port, which makes it tough to deploy behind firewalls, but I can't remove the firewall in this situation. FTP is built on a client–server model architecture using separate control and data connections between the client and the server. Then, depending on the FTP session mode, another connection between a set of ports is used …The File Transfer Protocol (FTP) is a standard communication protocol used for the transfer of computer files from a server to a client on a computer network. This is a good way to bypass firewalls because organizational FTP servers are often placed where they have more access to other internal hosts than any old Internet host would.The FTP connection is then established to the FTP server’s port 21. The error message will describe whether the port is open or not. Ftp ports Simply ask the FTP server to send a file to each interesting port of a target host in turn.
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