Ftp Error 226 Transfer Complete
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good, bad or incomplete: Range Purpose 1xx Positive Preliminary reply The requested action is being initiated; expect another reply before ftp error codes proceeding with a new command. (The user-process sending another command before ftp error 426 the completion reply would be in violation of protocol; but server-FTP processes should queue any commands that arrive
Ftp Error 421 Service Not Available
while a preceding command is in progress.) This type of reply can be used to indicate that the command was accepted and the user-process may now pay attention
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to the data connections, for implementations where simultaneous monitoring is difficult. The server-FTP process may send at most, one 1xx reply per command. 2xx Positive Completion reply The requested action has been successfully completed. A new request may be initiated. 3xx Positive Intermediate reply The command has been accepted, but the requested action is being held in ftp error 500 abeyance, pending receipt of further information. The user should send another command specifying this information. This reply is used in command sequence groups. 4xx Transient Negative Completion reply The command was not accepted and the requested action did not take place, but the error condition is temporary and the action may be requested again. The user should return to the beginning of the command sequence, if any. It is difficult to assign a meaning to "transient", particularly when two distinct sites (Server- and User-processes) have to agree on the interpretation. Each reply in the 4xx category might have a slightly different time value, but the intent is that the user-process is encouraged to try again. A rule of thumb in determining if a reply fits into the 4xx or the 5xx (Permanent Negative) category is that replies are 4xx if the commands can be repeated without any change in command form or in properties of the User or Server (e.g., the command is spelled the same with the same argu
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Ftp 530
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Reported by: nathanila Owned by: Priority: normal Component: FileZilla Server Keywords: Cc: Component version: Operating system type: Windows Operating system version: 7 64-bit Description I am trying to debug a situation. My FTP client initiates a download of a file https://trac.filezilla-project.org/ticket/9888 using EPSV. FileZilla FTP Server writes all of the file data into the data socket buffer. FileZilla FTP Server then sends reply code 226 (closing data connection. Requested file action successful) on the command socket. Using Wireshark, I can see that the 226 packet is sent on the network before the entire file is sent. At some point during the file transfer, a packet fails to be ACKed by the client. The ftp error server OS retransmits the packet 4 more times and then gives up. This problem is not FileZilla's issue. The problem is that FileZilla FTP Server will send 226 before the data transfer is complete. Instead, FileZilla should wait to see if there are any problems with the data transfer and only send 226 when it has fully finished. Oldest first Newest first Threaded Comments only Change History (3) comment:1 Changed 2 years ago ftp error codes by codesquid Resolution set to rejected Status changed from new to closed Your client must be prepared to receive the 226 before the FIN on the data connection, there is no ordering of packets between two different TCP connections. When FileZilla Server sends the 226, the transfer has already finished successfully from its point of view. Unless you artificially delay every transfer for 4 minutes (the maximum allowed RTO of TCP) there'll always be cases where a client sees the 226 before receiving, or failing to receive, the FIN on the data connection. Your client should only recognize the transfer as successful if it has both received a FIN on the data connection as well as the 2yz to the transfer command. If the connection is closed by RST or a timeout or if a non-2yz reply code is being received, then the transfer has not been successful. comment:2 Changed 2 years ago by nathanila Resolution rejected deleted Status changed from closed to reopened My client ignores the 226 until the data has been fully received. It properly flags a problem if it doesn't receive the FIN or 2yz. This is how I knew there was a problem. The problem is that FileZilla Server doesn't wait for the FIN to be sent. It doesn't complain ab