Comment 7 for bug 1385599

I'm suggest this modification in ftpbackend.py :

        self.tempfile, self.tempname = tempdir.default().mkstemp()
        if self.parsed_url.scheme == 'ftps':
            os.write(self.tempfile, "set ftp:ssl-allow true\n")
            os.write(self.tempfile, "set ftp:ssl-protect-data true\n")
            os.write(self.tempfile, "set ftp:ssl-protect-list true\n")
        else:
            os.write(self.tempfile, "set ftp:ssl-allow false\n")
        os.write(self.tempfile, "set net:timeout %s\n" % globals.timeout)
        os.write(self.tempfile, "set net:max-retries %s\n" % globals.num_retries)
        os.write(self.tempfile, "set ftp:passive-mode %s\n" % self.conn_opt)
        os.write(self.tempfile, "open %s %s\n" % (self.portflag, self.parsed_url.hostname))

it's working as fine.