FileZilla Server 連線問題

昨天研究好久 終於手機連上了
只是打開後除了Logged on 多了一行紅字??
所有訊息如下
FileZilla Server 0.9.60 beta
Copyright 2001-2016 by Tim Kosse (tim.kosse@filezilla-project.org)
https://filezilla-project.org/
Connecting to server 127.0.0.1:14147...
Connected, waiting for authentication
Logged on

紅字是
You appear to be behind a NAT router. Please configure the passive mode settings and forward a range of ports in your router.
Warning: FTP over TLS is not enabled, users cannot securely log in.

搞不懂這是甚麼問題

求解 謝謝