File Transfer Protocol (FTP)

Internet Standard Oct 1985 View Official Document →

Abstract

RFC 959 defines the File Transfer Protocol (FTP), enabling file transfers between a client and server over separate control (port 21) and data connections (port 20). It specifies commands (USER, PASS, RETR, STOR, etc.), the reply code numbering system, and active/passive transfer modes.

Defined Status Codes

FTP 200 Command OK FTP 220 Service Ready FTP 226 Closing Data Connection FTP 227 Entering Passive Mode FTP 230 User Logged In FTP 421 Service Not Available FTP 425 Can't Open Data Connection FTP 426 Connection Closed FTP 500 Syntax Error FTP 530 Not Logged In FTP 550 File Unavailable

Defined Terms

Authentication TCP/IP Port Number