vsftp问题“227 Entering Passive Mode”

①昨天测试防火墙

#iptables -P INPUT DROP

②再配置规则，使21与20端口能通过

#iptables  -I INPUT -p tcp --sport 21 -j ACCEPT

#iptables -I INPUT  -p tcp --sport 20 -j ACCEPT

③然后访问ftp服务遇到问题

#ftp localhost

Connected to localhost.localdomain.
220 (vsFTPd 2.0.5)
530 Please login with USER and PASS.
530 Please login with USER and PASS.
KERBEROS_V4 rejected as an authentication type
Name (localhost:root):  anonymous
331 Please specify the password.
Password:
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.

ftp>  ls
227 Entering Passive Mode (127,0,0,1,34,109)

》》》》出现问题，停着不动了《《《《

 

想了很久，解决如下：

登陆ftp后

先要

ftp>  passive             （查看被动模式状态）
Passive mode  on.

要改为off才正常

ftp>  passive               （同样的命令关闭）
Passive mode  off.

 

现在

ftp>  ls
200 PORT command successful. Consider using PASV.
150 Here comes the directory listing.
drwxr-xr-x    4 0        0            4096 Sep 08 01:37 pub
226 Directory send OK.
ftp>  cd pub
250 Directory successfully changed.

一切正常