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How does Active FTP work?
Posted by on 24 August 2012 06:43 PM
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In active mode FTP the client connects from a random unprivileged port (poer number > 1023) to the FTP server's command port, port 21. Then, the client starts listening to port N+1 and sends the FTP command PORT N+1 to the FTP server. The server will then connect back to the client's specified data port from its local data port, which is port 20.
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