yum挂载ftp上无法安装问题

今天早上做自动化部署系统时，安装完vsftp后启动完成，怎么也安装不了安装包报错如下：

Total download size: 956 k
Installed size: 2.1 M
Downloading Packages:
ftp://192.168.131.149/rhel6/Packages/dhcp-4.1.1-25.P1.el6.i686.rpm: [Errno 14] PYCURL ERROR 9 - "Server denied you to change to the given directory"
Trying other mirror.
ftp://192.168.131.149/rhel6/Packages/dhcp-common-4.1.1-25.P1.el6.i686.rpm: [Errno 14] PYCURL ERROR 9 - "Server denied you to change to the given directory"
Trying other mirror.

Error Downloading Packages:
12:dhcp-4.1.1-25.P1.el6.i686: failure: Packages/dhcp-4.1.1-25.P1.el6.i686.rpm from base: [Errno 256] No more mirrors to try.
12:dhcp-common-4.1.1-25.P1.el6.i686: failure: Packages/dhcp-common-4.1.1-25.P1.el6.i686.rpm from base: [Errno 256] No more mirrors to try
没办法，只能一点排错了 先是从新关下防火墙 。试试还是不好使，只好重新安装下 vsftp ，重启后还是不行
最后看了下文档发现有个命令没有打 打完后就好用了