[求助]FTP怎么会经常出现下载不了的情况？

[R] 正在连接到 ftp.plcjs.com -> DNS=ftp.plcjs.com IP=125.91.8.11 PORT=21
[R] 已连接到 ftp.plcjs.com
[R] 220-BBSFTP Pro- [http://www.bbsftp.net/]
[R] 220 Serv-U FTP Server v6.3 for WinSock ready...
[R] USER plcjs_yaojin
[R] 331 User name okay, need password.
[R] PASS (hidden)
[R] 230-(bbsftp v2.5) [Cache Update Disabled!]
[R] 230 User logged in, proceed.
[R] SYST
[R] 215 UNIX Type: L8
[R] FEAT
[R] 550 Command Not Support!
[R] REST 100
[R] 350 Restarting at 100. Send STORE or RETRIEVE.
[R] REST 0
[R] 350 Restarting at 0. Send STORE or RETRIEVE.
[R] PWD
[R] 257 "/" is current directory.
[R] CWD /下载区/OMRON
[R] 250 Directory changed to /下载区/OMRON
[R] PWD
[R] 257 "/下载区/OMRON" is current directory.
[R] TYPE I
[R] 200 Type set to I.
[R] PASV
[R] 227 Entering Passive Mode (125,91,8,11,19,252)
[R] 正在打开数据连接 IP: 125.91.8.11 端口: 5116
[R] RETR CX-one v2.0简装版.rar
[R] 550 Permission denied.
[R] 传输失败!
传输队列已完成
1 个文件传输失败

看提示啊， 很麻烦！！

初来学习了

就是这样的