How do you run an FTP client behind a firewall?

To run an FTP client behind a firewall, you typically need to ensure that the necessary ports for FTP are open. FTP uses port 21 for commands, and for passive mode, it may require a range of high-numbered ports (usually between 1024 and 65535) for data transfer. Configure the firewall to allow these ports, or set the FTP client to use passive mode, which is often more firewall-friendly. Additionally, consider using secure FTP variants, like FTPS or SFTP, which can help manage connections through firewalls more effectively.