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FTPS Control
FTPS (File Transfer Protocol Secure) Control utilizes port 990 to establish an encrypted communication channel for managing connections in an FTP over TLS/SSL environment. It provides authentication and command exchange securely, protecting data integrity and confidentiality during the initiation of file transfers..
FTPS, or FTP Secure, extends the traditional File Transfer Protocol by adding SSL/TLS encryption. The control connection, which coordinates commands and responses between client and server, typically operates over port 990 in implicit mode. When a client connects to port 990, it immediately expects an encrypted SSL/TLS session, differing from explicit FTPS which negotiates encryption after an initial plaintext connection.
In implicit FTPS, all communications including authentication credentials and commands are encrypted from the beginning, offering enhanced privacy and data protection during session negotiations. This encryption ensures sensitive commands such as login credentials are not transmitted in cleartext over the network.
The FTPS control channel then facilitates negotiation of separate dynamic data connections, encrypted as well, used for the actual transfer of files. Support for both active and passive FTP modes is maintained, but both the control and data connections are secured via SSL/TLS certificates, often requiring mutual verification for enhanced security.