我刚刚架设的server u ftp，有的可以连接，大多数则报一下错误，请高手制导阿，为什么啊？
我是通过路由出去的ftp server

已连接. 正在等待回应.            
220 Serv-U FTP Server v6.4 for WinSock ready...
USER parttime
331 User name okay, need password.
PASS xxxxxx
230 User logged in, proceed.
SYST
215 UNIX Type: L8
REST 100
350 Restarting at 100. Send STORE or RETRIEVE.
REST 0
350 Restarting at 0. Send STORE or RETRIEVE.
CWD /
250 Directory changed to /
PWD
257 "/" is current directory.
TYPE A
200 Type set to A.
PORT 192,168,1,100,5,222
200 PORT Command successful.
LIST
150 Opening ASCII mode data connection for /bin/ls.
错误:  [Data]: 连接异常         
426 Data connection closed, transfer aborted.
PASV
227 Entering Passive Mode (58,24,90,99,48,114)
错误:  [Data]: 连接超时