![]() ![]() The conversation between client and server is performed in plain text-all communication between the two parties is sent unprotected, verbatim, over the internet. The Control Connection remains idle until the end of this exchange, when it reports that the file transfer has either failed or was completed successfully. After authentication, the client and server will typically, through a series of synchronized commands controlled by the Command Connection, negotiate a new common port called the Data Connection over which the file will be transferred. The FTP client will usually authenticate itself with the FTP server by sending over a username and a password. This main connection is called the Control Connection or Command Connection. An FTP server will listen for client connections on port 21.įTP clients will then connect to the FTP server on port 21 and initiate a conversation. The FTP protocol typically uses port 21 as its main means of communication. One computer acts as the server to store information and the other acts as the client to send or request files from the server. FTP (File Transfer Protocol)įTP is a very well-established protocol, developed in the 1970s to allow two computers to transfer data over the internet. SFTP is a completely different protocol (in spite of the similar acronym) that is natively secure and more efficient. ![]() FTP/S takes the security up a step in that it allows you to secure all or part of a session (at the cost of speed). FTP, FTP/S, and SFTP are common acronyms, but did you know that there are some significant differences among them? Notably, FTP in its basic form is not secure. ![]()
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