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Illustration of starting a passive connection using port 21. FTP may run in active or passive mode, which determines how the data connection is established. [9] (This sense of "mode" is different from that of the MODE command in the FTP protocol.) In active mode, the client starts listening for incoming data connections from the server on port M.
The "Server port" column indicates the port from which the server transmits data. In the case of FTP, this port differs from the listening port. Some protocols—including FTP, FTP Secure, FASP, and Tsunami—listen on a "control port" or "command port", at which they receive commands from the client.
Below is a list of FTP commands that may be sent to a File Transfer Protocol (FTP) server. It includes all commands that are standardized by the Internet Engineering Task Force (IETF) in RFC 959, plus extensions.
This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for bidirectional traffic. TCP usually uses port numbers that match the services of the corresponding UDP implementations, if they exist, and vice versa.
Help message. Explains how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user. 215: NAME system type. Where NAME is an official system name from the registry kept by IANA. 220: Service ready for new user. 221: Service closing control connection. Logged out if appropriate. 225
However, as a UDP equivalent of FTP, official FSP servers frequently run on UDP port 21, which is the same as FTP's TCP port number. Because FSP uses UDP and FTP uses TCP they can both run at same time on the same port number without conflict. Unofficial servers may run on any port, although 2121 was a popular choice. (On most *nix systems ...
The goal of SSH was to replace the earlier rlogin, TELNET, FTP [14] and rsh protocols, which did not provide strong authentication nor guarantee confidentiality. He chose the port number 22 because it is between telnet (port 23) and ftp (port 21). [15] Ylönen released his implementation as freeware in July 1995, and the tool quickly gained in ...
An FTP server plays the role of a server in a client–server model using the FTP and/or the FTPS and/or the SFTP network protocol(s). [citation needed] An FTP server can also be intended as a computer that runs an FTP server program to host collections of files. Big FTP sites can be run by many computers in order to be able to serve the ...