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The client does a passive open. If this response is acceptance and the data connection ended with FIN, the client knows that it has received the entire file from the server. However, many clients can take advantage of REST to save time if a previous transfer was interrupted in the middle. W ! !

Note that all FTP implementation must support data transfer using the default port, and that only the USER-PI may initiate the use of non-default ports. Error Code List 1 Unsupported protocol. STOUStore unique. Since there are other hosts on the ARPA-Internet which have tree-like directories (including TOPS-20 and Multics), these commands are as general as possible.

Lebling, P. It rejects the RETR request with code 425 if the connection attempt fails; otherwise it proceeds normally. x5x File system These replies indicate the status of the Server file system vis-a-vis the requested transfer or other file system action. OPTSOptions.

That is, with a TOPS-20 server FTP, the command sequence MKD MYDIR CWD MYDIR will fail. Updates FTP to support TLS. For example, "System going down in 15 minutes". Remember that at most, one 100 series reply is allowed per command.

FTP, File Transfer Protocol Description Glossary RFCs Publications Obsolete RFCs Description: Protocol suite: TCP/IP. RFC 2389 PASSPassword. In the latter case, the process will repeatedly try to deliver the mail for several days. RFC 959 STATStatus.

LPRTLong data port. x5z File system These replies indicate the status of the Server file system vis-a-vis the requested transfer or other file system action. RNTORename to. AUTHAuthentication/Security Mechanism.

The command syntax is specified here. Harrenstien, Ken, "FTP Extension: XSEN", RFC 737 (NIC 42217), SRI-KL, 31 October 1977. Updated by: RFC 294. ACCTAccount.

RFC 959 MLSD RFC 3659 MLST RFC 3659 MODETransfer mode. Obsoletes: RFC 765. [RFC 1123] Requirements for Internet Hosts -- Application and Support. [RFC 1415] FTP-FTAM Gateway Specification. [RFC 1579] Firewall-Friendly FTP. [RFC 1635] How to Use Anonymous FTP. [RFC 1639] Sussman, Julie, "FTP Error Code Usage for More Reliable Mail Service", RFC 630 (NIC 30237), BBN, 10 April 1974. Word 2: Data Length.

Certain commands require a second reply for which the user should also wait. The reply codes for RMD be identical to the reply codes for its file analogue, DELE. Note that this second model could also be used to represent the first group of commands, the only difference being that in the first group the 100 series replies are unexpected Each entry may be EMPTY, or may point to a page.

If the server is unable to accept input right away, a 120 "expected delay" reply should be sent immediately and a 220 reply when ready. We note that the above three models are similar. Padlipsky, Mike, "An FTP Command-Naming Problem", RFC 506 (NIC 16157), MIT-Multics, 26 June 1973. those not processed by the FTP server) will NOT carry reply codes and may occur anywhere in the command-reply sequence.

However, a few applications use the underlying page structures directly, and some of these create holey files. Most existing servers skip a different number of bytes for text files. At least one of these must contain the appropriate reply code to NWG/RFC# 640 JBP NJN 5-JUN-74 16:07 30843 Neigus FTP Reply Codes [3] indicate the state of the transaction. Braden, Bob, "FTP Data Compression", RFC 468 (NIC 14742), UCLA/CCN, 8 March 1973.

Any time either the user or server see that the connection is being closed by the other side, it should promptly read any remaining data queued on the connection and issue Preliminary replies are listed first (with their succeeding replies indented and under them), then positive and negative completion, and finally intermediary replies with the remaining commands from the sequence following. The command-reply sequence is listed below where the messages are vertically synchronous but horizontally asynchronous: User-PI - Server A User-PI - Server B ------------------ ------------------ C->A : Connect C->B : Connect Defines FTP commands FEAT and OPTS. [RFC 2428] FTP Extensions for IPv6 and NATs.

The user should return to the beginning of the command sequence, if any. The transfer was reported bad by the server. 21 FTP quote error. Page type unknown. 552Requested file action aborted. 553Requested action not taken. 554Requested action not taken: invalid REST parameter. 555Requested action not taken: type or stru mismatch. Also, the end of file pointer is simply a number.

PWD Print the current working directory name. W !---------->! McKenzie, Alex, "A Suggested Addition to File Transfer Protocol", RFC 281 (NIC 8163), BBN, 8 December 1971. PROTData Channel Protection Level.

Below is a list of all known return codes that may be issued by an FTP server. SITESite parameters. There is one state diagram for each group of FTP commands or command sequences. A failure at any point in the sequence necessitates the repetition of the entire sequence from the beginning. 8 Details of the command-reply sequence will be made explicit in a state

To prevent a race condition here, the server sends a reply (226) after closing the data connection (or if the connection is left open, a "file transfer completed" reply (250) and