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File Transfer Protocol
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==FTP reply codes== {{main article|List of FTP server return codes}} Below is a summary of [[List of FTP server return codes|FTP reply codes]] that may be returned by an FTP [[Server (computing)|server]]. These codes have been standardized in {{IETF RFC|959}} by the IETF. The reply code is a three-digit value. The first digit is used to indicate one of three possible outcomes β success, failure, or to indicate an error or incomplete reply: * 2yz – Success reply * 4yz or 5yz – Failure reply * 1yz or 3yz – Error or Incomplete reply The second digit defines the kind of error: * x0z – Syntax. These replies refer to syntax errors. * x1z – Information. Replies to requests for information. * x2z – Connections. Replies referring to the control and data connections. * x3z – Authentication and accounting. Replies for the login process and accounting procedures. * x4z – Not defined. * x5z – File system. These replies relay status codes from the server file system. The third digit of the reply code is used to provide additional detail for each of the categories defined by the second digit.
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