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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Key Applications and Application Protocols
           9  TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)
                9  TCP/IP General File Transfer Protocols (FTP and TFTP)
                     9  File Transfer Protocol (FTP)
                          9  FTP Commands and Replies

Previous Topic/Section
FTP Internal Protocol Commands and Command Groups
Previous Page
Pages in Current Topic/Section
12
3
45
Next Page
FTP User Interface and User Commands
Next Topic/Section

FTP Replies, Reply Code Format and Important Reply Codes
(Page 3 of 5)

Combining Digit Values to Make Specific Reply Codes

These “x”, “y” and “z” digit meanings are combined to make specific reply codes. For example, consider reply code “530”, diagrammed in Figure 292. The first digit tells you that this is a permanent negative reply; the second indicates that it is related to login or accounting. (It is in fact an error message received when a login fails.)


Figure 292: FTP Reply Code Format

This diagram shows how the three-digit FTP reply code format is interpreted. In this example, reply code 530, the “5” indicates a permanent error, the “3” specifies that the error is related to authentication or accounting, and the “0” is the specific error type. A similar method is used for reply codes in many other TCP/IP application protocols, including SMTP and HTTP.

 


Using “encoded” reply codes allows the code itself to immediately communicate information, and provides a way of keeping different types of responses organized. The idea described above was adapted for use by several other application protocols, including SMTP for e-mail, NNTP for network news and HTTP for the World Wide Web.


Previous Topic/Section
FTP Internal Protocol Commands and Command Groups
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45
Next Page
FTP User Interface and User Commands
Next Topic/Section

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