Ftp Active Vs Passive?
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Active FTP is an older method for transferring files between a client and server. It opens two connections between the client and server. The command channel is used to send commands back and forth from the client to the server, while the data channel is used to transfer the actual file data by opening a separate connection.
Passive FTP is more secure and is the default option for many FTP client programs. In passive mode, the client initiates the control connection and then the server will establish the data connection from its end when a file transfer request is made by the client. This means the server can open incoming connections to the client and can avoid any problems caused by firewall or NAT settings.