![]() The mod_sftp module implements the SSH2 protocol and its SFTP SSH Key Exchange Method Using Curve25519 and Curve448 (RFC 8731).Use of RSA Keys with SHA-256 and SHA-512 in the SSH Protocol (RFC 8332).SSH Increased Minimum DH Group Size (RFC 8270).SSH Elliptic Curve Algorithms (RFC 5656).SSH RSA Key Exchange Protocol (RFC 4432).SSH Diffie-Hellman Group Exchange Protocol (RFC 4419).SSH Transport Encryption Modes (RFC 4344).SSH Channel "Break" Extension (RFC 4335).SSH Keyboard-Interactive Authentication (RFC 4256).For this reason, many sites prefer SFTPįor those wishing to learn more about the SSH2 and SFTP protocols, see: Uses a single TCP connection, and multiplexes multiple transfers or "channels" SFTP is based on the SSH2 protocol, which usesīinary encoding of messages over a secure channel. Widespread among FTPS clients and servers the mod_tls module doesīy contrast, SFTP refers to "Secure File Transfer Protocol", and is not Unfortunately, support for the CCC command is not There is a third solution: the CCC FTPĬommand, which clears the FTP control channel of encryption, once the user hasĪuthenticated. ![]() The network firewall must resort to using a statically configured range of However, FTPS encrypts those packets, and thus The network equipment, now, often inspects the application-levelĭata in FTP packets in order to dynamically open the necessary firewall rulesįor the FTP data channels. Single TCP connection which can be passed through firewalls/NAT/routerĮquipment. ![]() The need for these multiple connections is undesirable for many networkĪdministrators, especially those that wish to restrict all protocols to a Since FTPS is still FTP, anyįTPS sessions require multiple TCP connections: one TCP connection for theįTP control channel, and separate TCP connections for each FTP data channel. The mod_tls module for ProFTPD implements FTPS. In fact, that is where the name "FTPS" comes from. Made to run over an SSL/TLS connection in this manner, it is very similar to There is a great deal of confusion and misunderstanding surrounding two veryįTPS stands for "FTP over SSL/TLS". ![]()
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