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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.
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.
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.
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.
In order to do this, an employee can set up remote port forwarding through SSH on the company's internal computers by including their FTP server’s address and using the correct port numbers for FTP (standard FTP port is TCP/21) [10] Opening remote desktop sessions is a common use of remote port forwarding.
The following tables compare general and technical information for a number of File Transfer Protocol (FTP) clients. Unless otherwise specified in footnotes, comparisons are based on the stable versions without any add-ons, extensions, or external programs.
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 ...
TCP uses 16-bit port numbers, providing 65,536 possible values for each of the source and destination ports. [17] The dependency of connection identity on addresses means that TCP connections are bound to a single network path; TCP cannot use other routes that multihomed hosts have available, and connections break if an endpoint's address changes.