J-ftpd [The Java FTP Daemon]

_{pasv list user pass type retr stor stou rein cdup syst noop smnt acct quit port stru help mode allo rnfr allo rnto abor dele site nlst
stat rest}

8. CONNECTION ESTABLISHMENT

   The FTP control connection is established via TCP between the user
   process port U and the server process port L.  This protocol is
   assigned the service port 21 (25 octal), that is L=21.

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