File Transfer Protocol (FTP) uploads and downloads large files to and from an FTP server. By default, FTP transmits data in cleartext, making it easy for an attacker to capture and read FTP data with protocol analyzer. FTP active mode uses TCP port 21 for control signals and TCP port 20 for data. FTP passive mode (also known asPASV) uses TCP port 21 for control signals, but it uses a random TCPport for data. If FTP traffic is going through a firewall, this random port is often blocked, so it is best to disable PASV in FTP clients.
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