proftp问题，请救命！

yh_l

ftp 192.168.1.1
Connected to 192.168.1.1.
220 ProFTPD 1.2.9 Server (ProFTPD Default Installation) [ftp_server]
User (192.168.1.1none)): yh_l
331 Password required for yh_l.
Password:
230 User yh_l logged in.
ftp>; mkdir ls
257 "/home/yh_l/ls" - Directory successfully created
ftp>; cd ls
250 CWD command successful.
ftp>; dir
200 PORT command successful
425 Unable to build data connection: Connection refused

mep

在客户端有防火墙?使用passive mode