SSH stands for “Secure Shell” and is a cryptographic protocol for securing data communications. This method of file transfer uses SSH to transfer encrypted data. A standard FTP client communicates control with the server on port 21, FTPS normally uses port 990 and the data comes back on port 989, however FTPS can be implemented to use port 20 and 21 for both FTP and FTPS sessions. Generally Implicit mode is considered a deprecated method of negotiating TLS/SSL for FTP.īecause FTPS uses TLS as its underlying security it does require a valid TLS security certificate issued and signed by a Certificate Authority to be accepted without any error. There is one other “gotcha” with FTPS and that is the “Well Known Ports” used by the client. In “Implicit” mode your FTP client must negotiate a secure transfer or fail the connection. In “explicit” mode, the client (you) can either initiate secured or un-secured transfers, providing the sever is configured to support this. There are two modes to the FTPS protocol, one is called “explicit” the other “implicit.” Take note though that SSL is very broken in terms of security and has now been disabled by most hosting providers (see our article on the Poodle Exploit for more information). This variant of FTP uses Transport Layer Security (SSL/TLS) to secure data. However, SFTP and FTPS use two very different technology implementations and your hosting provider may not support all options. FTP in its original form is still a handy file transfer option and its two main variants SFTP and FTPS are commonly used as a secure method of transferring files also. It has endured and morphed as the Internet has grown.
FTP stands for File Transfer Protocol and was defined as early as 1971 in the very early days of the experimental Internet. There are numerous ways to transfer files these days, the oldest and still very widely used method is FTP.
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