![]() It then reports that the file transfer was either successful or failed. The control channel remains idle until the file transfer is complete. If multiple files are to be sent concurrently, a range of data channel ports must be used. Once the file transfer is complete, the data channel is closed. The command channel remains open until the client disconnects, or the server ends the connection due to inactivity or other reasons.Īfter authentication, the client and server will then negotiate a new common server port for the data channel, over which the file will be transferred. FTP clients will connect to this port to initiate a conversation for file transfer and authenticate themselves by sending a username and password. The command channel is responsible for accepting client connections and executing other simple commands. The FTP protocol uses two separate channels – the command (or control) channel and the data channel – to exchange files. We get these questions often, so it’s time to lay it all out in a blog post.įor each file transfer option, we’ll review:įTP (File Transfer Protocol) How FTP worksįTP, which stands for File Transfer Protocol, was developed in the 1970s to allow files to be transferred between a client and a server on a computer network. Why should I use SFTP over FTP? Is FTPS secure enough for my data? What’s the difference between FTPS and SFTP? Learn more about how FTP, FTPS, and SFTP work, their pros and cons, and when you should use them.įTP, FTPS, SFTP – so many acronyms and letters, so little time to decipher what they all mean.
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