我使用FTP而不是隐式SSL来上传一些文件.我遇到以下错误消息
[Command] PWD
[Response] 257 "/" is current directory.
[Command] PWD
[Response] 257 "/" is current directory.
[Command] TYPE A
[Response] 200 Type set to A
[Command] PWD
[Response] 257 "/" is current directory.
[Command] PASV
[Response] 227 Entering Passive Mode (10,0,0,19,195,113)
[Command] LIST -aL
[Response] 521 PROT P required
[Command] PWD
[Response] 257 "/" is current directory.
[Command] PASV
[Response] 227 Entering Passive Mode (10,0,0,19,195,114)
[Command] LIST -aL
[Response] 521 PROT P required
[Status] Failed::FTP protocol error. 521 PROT …