FTP is an unusual service in that it utilizes two ports, a 'data' port and a 'command' port (also known as the control port). Traditionally these are port 21 ...
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 ...
Standard FTP ports can be ports 20 and 21 since FTP was officially assigned both. Port 21 is referred to as a controlled port, while port 20 is the data port.
2022年8月16日 — FTP uses control and data channels, each using a separate TCP port. Port 21 is for the control channel, and port 20 is for the data channel.
2023年7月6日 — FTP ports are used to identify the apps and services that you want to access on the server. The port will use numbers from 0 to 65535 for this.
2022年12月14日 — The data connection uses the FTP port 20. FTP default port number is 21 to specify the control connection. You can change the standard FTP port ...
