filezilla搭建FTP外网访问读取目录失败求解

Question

在校园网环境下用filezilla搭建了FTP服务器想实现外网访问，使用Sakura FRP进行内网穿透之后Filezilla server在访问时出现如下错误

(000004)2021/12/5 14:47:00 - (not logged in) (127.0.0.1)> 220-FileZilla Server 中文版 0.9.60 beta
(000004)2021/12/5 14:47:00 - (not logged in) (127.0.0.1)> 220-written by Tim Kosse ([e-mail])
(000004)2021/12/5 14:47:00 - (not logged in) (127.0.0.1)> 220 Please visit https://filezilla-project.org/
(000004)2021/12/5 14:47:00 - (not logged in) (127.0.0.1)> USER noname
(000004)2021/12/5 14:47:00 - (not logged in) (127.0.0.1)> 331 Password required for noname
(000004)2021/12/5 14:47:00 - (not logged in) (127.0.0.1)> PASS ******
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> 230 Logged on
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> FEAT
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> 211-Features:
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  MDTM
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  REST STREAM
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  SIZE
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  MLST type*;size*;modify*;
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  MLSD
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  AUTH SSL
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  AUTH TLS
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  PROT
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  PBSZ
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  UTF8
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  CLNT
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  MFMT
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  EPSV
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)>  EPRT
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> 211 End
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> OPTS UTF8 ON
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> 202 UTF8 mode is always enabled. No need to send this command.
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> CWD /
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> 250 CWD successful. "/" is current directory.
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> PASV
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> 227 Entering Passive Mode (127,0,0,1,237,249)
(000004)2021/12/5 14:47:00 - noname (127.0.0.1)> MLSD
(000004)2021/12/5 14:47:11 - noname (127.0.0.1)> 425 Can't open data connection for transfer of "/"
(000004)2021/12/5 14:47:12 - noname (127.0.0.1)> disconnected.

filezilla的被动模式的设置如下图

已经禁用了IP检查
Sakura FRP映射了21 和 60921的数据端口
系统防火墙的入站规则和出站规则添加了21端口和60921
关闭了Windows defender的防火墙
装有火绒
是校园网的问题吗

Answer 1