无论使用的是Serv-U还是系统自带的FTP都会产生同样的问题，读取目录列表失败，现附上FileZilla和FlashFXP连接提示，望大神给与解决方法。
FileZilla连接提示如下：
状态:正在连接 182.*.*.12:21...
状态:连接建立，等待欢迎消息...
响应:220 Serv-U FTP Server v6.4 for WinSock ready...
命令:USER badwolf
响应:331 User name okay, need password.
命令:PASS *********
响应:230 User logged in, proceed.
命令:CLNT FileZilla
响应:200 Noted.
状态:已连接
状态:读取目录列表...
命令:PWD
响应:257 "/" is current directory.
命令:TYPE I
响应:200 Type set to I.
命令:PORT 192,168,1,6,254,179
响应:200 PORT Command successful.
命令:MLSD
响应:150 Opening BINARY mode data connection for MLSD.
错误:连接超时
错误:读取目录列表失败
FlashFXP连接提示如下：
[右] 正在连接到 测试 -> IP=182.*.*.12 PORT=21
[右] 已连接到 测试
[右] 220 Serv-U FTP Server v6.4 for WinSock ready...
[右] USER badwolf
[右] 331 User name okay, need password.
[右] PASS (hidden)
[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 4.3.1.1957
[右] 200 Noted.
[右] PWD
[右] 257 "/" is current directory.
[右] MODE Z
[右] 200 MODE Z ok.
[右] 侦听于端口: 49200，正在等候连接。
[右] PORT 192,168,1,6,192,48
[右] 200 PORT Command successful.
[右] MLSD
[右] 150 Opening BINARY mode data connection for MLSD.
[右] 426 Data connection closed, transfer aborted.
[右] 列表 错误
[右] 数据 Socket 错误: 连接失败
[右] 以 PORT 模式连接失败，正在尝试使用 PASV 模式。

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