if (passiveLocalHost != null) {
                ftpClient.setPassiveLocalIPAddress(passiveLocalHost);
            }
            if (reportActiveExternalHost != null) {
                ftpClient.setReportActiveExternalIPAddress(reportActiveExternalHost);
            }
            if (activeMinPort != -1 && activeMaxPort != -1) {
                ftpClient.setActivePortRange(activeMinPort, activeMaxPort);
            }