First thing I should say is about the FTP active/passive mode, or say PORT/PASV mode.
We can read the differences from wikipedia or Active FTP vs. Passive FTP, a Definitive Explanation.
The two mode indicates who initialise the data connection and the active/passive is used to describe server’s action.
Active mode: server create a connection to the port client gives.
Passive mode: server receive a connection from a client.
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