Internet TCP port 990 is primarily used for FTPS (File Transfer Protocol Secure) services. FTPS is an extension to the commonly used FTP protocol that adds support for the Transport Layer Security (TLS) and the Secure Sockets Layer (SSL) cryptographic protocols. Examples of software that use this port include FileZilla, WinSCP, and Core FTP. These applications use port 990 to securely transfer files between client and server.
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