In that post, twice the author said listening on a random port, it is correct to a level...

  1. Both the user and the server-DTPs have a default data port. The user-process default data port is the same as the control connection port (i.e., U). The server-process default data port is the port adjacent to the control connection port (i.e., L-1).
  2. Default Data Connection Ports: All FTP implementations must support use of the default data connection ports, and only the User-PI may initiate the use of non-default ports.
  3. Negotiating Non-Default Data Ports: The User-PI may specify a non-default user side data port with the PORT command. The User-PI may request the server side to identify a non-default server side data port with the PASV command.

In reply to Re^2: Net::FTP takes a very long time in Passive mode by pg
in thread Net::FTP takes a very long time in Passive mode by Cody Pendant

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