![]() ![]() The client then initiates the connection from it’s second port to transfer data.Ī secure FTP server follows the above procedure with one minor difference the command port used is reserved port 990. In response the server opens a random unprivileged port and sends the PORT P command back to the client. ![]() The first port contacts the server on port 21, and issues the PASV command. A client first opens two consecutive random unprivileged ports (ports above 1023). In passive mode a client initiates both connections to the server. Most browsers use passive mode for connection this mode changes the data port as follows. Depending on the operating mode, the data port is not always on port 20. FTP uses two ports, a command (control) port and data port traditionally these are assigned ports 21 and 20 respectively. ![]()
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