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Posts Tagged Passive FTP

04.28.2009

Active FTP vs. Passive FTP and firewall issues

The Basics FTP is a TCP based service exclusively. There is no UDP component to FTP. FTP is an unusual service in that it utilizes two ports, a ‘data’ port and a ‘command’ port (also known as the control port). Traditionally these are port 21 for the command port and port 20 for the data […]