报错有两个问题
1、You appear to be behind a NAT router. Please configure the passive mode settings and forward a range of ports in your router.
解决方法：
Edit”-“Setting”或直接点击设置按钮（齿轮）;
选择“Passive mode settings”选项卡，勾选“Use the following IP:”并填写服务器的IP地址，之后点击“OK”保存；
2、Warning: FTP over TLS is not enabled, users cannot securely log in.
解决方法：生成一个证书即可
