为什么FTP 列表错误

[右] 221 Goodbye!
[右] 注销: caxnet
[右] 正在连接到 caxnet -> IP=61.174.18.177 PORT=21
[右] 正在连接到 caxnet
[右] 220 Serv-U FTP Server v6.4 for WinSock ready...
[右] USER caxnet
[右] 331 User name okay, need password.
[右] PASS (隐藏)
[右] 230 User logged in, proceed.
[右] SYST
[右] 215 UNIX Type: L8
[右] FEAT
[右] 211-Extension supported
[右]  CLNT
[右]  MDTM
[右]  MDTM YYYYMMDDHHMMSS[+-TZ];filename
[右]  SIZE
[右]  SITE PSWD;EXEC;SET;INDEX;ZONE;CHMOD;MSG
[右]  REST STREAM
[右]  XCRC filename;start;end
[右]  MODE Z
[右]  MLST Type*;Size*;Create;Modify*;Win32.ea*;
[右] 211 End
[右] CLNT FlashFXP 3.2.0.1080
[右] 200 Noted.
[右] CWD /
[右] 250 Directory changed to /
[右] PWD
[右] 257 "/" is current directory.
[右] TYPE A
[右] 200 Type set to A.
[右] MODE Z
[右] 200 MODE Z ok.
[右] PORT 61,174,18,177,13,1
[右] 200 PORT Command successful.
[右] LIST -al
[右] 150 Opening ASCII mode data connection for /bin/ls.
[右] 426 Data connection closed, transfer aborted.
[右] 列表错误

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选项-----使用被动模式,关闭试一下