Runs over port 21 or 990. It adds a layer of TLS encryption to the traditional FTP protocol. If using FTPS, ensure your client is set to "Require explicit FTP over TLS."
1. Understanding the Orange Communication Network Environment orange communication ftp
As internet threats evolved, so did Orange's approach to FTP. The simple, unencrypted protocol became a liability for a major ISP. Runs over port 21 or 990