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how the data connection is established. (This sense of "mode" is different from that of the MODE command in the FTP protocol.)
* In active mode, the client starts listening for incoming data connections from the server on port M. It sends the FTP command PORT M to inform the server on which port it is listening. The server then initiates a data channel to the client from its port 20, the FTP server data port.
* In situations where the client is behind a firewall and unable to accept

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