ftp启用被动模式时出错

linuxage

环境 ：用isa发布了内网ftp（servU），用客户端flashFXP连接时出错；最奇怪的时，新安装servU时正常，一重启ftp服务，就出现这种问题，如果重新安装后，就会再正常；请教各位，问题在哪？

以下是FlashFXP连接及报错：

WinSock 2.0 -- OpenSSL 0.9.8b 04 May 2006
[右] 正在连接到 domainname -> IP=22.1.1.1 PORT=2111
[右] 已连接到 domainname
[右] 220 Serv-U FTP Server v6.3 for WinSock ready...
[右] USER username
[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 3.4.0.1145
[右] 200 Noted.
[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] PASV
[右] 500 The server returned invalid response for PASV command.
[右] 监听端口: 2522, 等待连接。
[右] PORT 192,168,2,164,9,218
[右] 500 Invalid PORT command.
[右] 列表错误