if (activeExternalHost != null) {
                ftpClient.setActiveExternalIPAddress(activeExternalHost);
            }
            if (passiveLocalHost != null) {
                ftpClient.setPassiveLocalIPAddress(passiveLocalHost);
            }
            if (reportActiveExternalHost != null) {
                ftpClient.setReportActiveExternalIPAddress(reportActiveExternalHost);
            }