File Transfer

FTP-DATA, operating on Port 20, is a core component of the File Transfer Protocol (FTP). It is responsible for the actual transfer of files between a client and a server. This port works in conjunction with Port 21, which handles the control commands.

What is File Transfer

FTP-DATA, associated with Port 20, is an essential part of the File Transfer Protocol (FTP), which is one of the oldest and most widely used protocols for transferring files over the Internet. FTP operates in a client-server model, where the client initiates a connection to the server to upload or download files.

Port 20 specifically handles the data transfer aspect of FTP. When a client requests a file transfer, the server opens Port 20 to send or receive the file data. This port works in tandem with Port 21, which manages the control commands and session management for the FTP connection.

FTP was developed in the early 1970s and has since evolved to support various features such as anonymous access, user authentication, and secure file transfers through extensions like FTPS and SFTP. Despite the advent of more modern file transfer protocols, FTP remains a staple in many network environments due to its simplicity and reliability.

File Transfer runs on TCP and UDP port 20 and is official IANA port.

Security risk

If Port 20 is open and the FTP service is running, it can be a target for unauthorized access and data breaches. Attackers may exploit vulnerabilities in the FTP service to gain access to sensitive files or use the open port for malicious activities. It is crucial to secure FTP services with strong authentication and encryption mechanisms.

In our UFW tutorial you can follow instructions how you can configure UFW to close port 20. Use StackChanges to monitor if the File Transfer port is closed and stays closed. StackChanges will send an alert if port 20 is open again.