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What is the purpose of using Passive FTP?


If your are behind a firewall, an Active FTP Connection may not work. You will then
have to use Passive FTP.

Active FTP:
With Active FTP Connection, you make a connection to the Server on Port 21. The
server responds back to the port you made a connection from. Now the Server
initiates a data connection to your Data port. Then the data port on your end
acknowledges the servers request. (The server initiates the data connection)

Passive FTP:
With Passive FTP Connection, you make a connection to the Server on Port 21. The
server responds back to the port you made a connection from. Now you initiate the
data connection to the random port specified by the server. Server acknowledges the
request and sends the data. The server will thus always be responding to client-
initiated requests on the Data Channel and the firewall can correlate these.

SW3B121


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