Error:Connection activation failed:Device not managed by NetworkManager

运行#ifup ifcfg-eth0时（/etc/init.d/network restart）, 重启网络连接时出现以下错误：

Bringing up interface eth0: Error:Connection activation failed:Device not managed by NetworkManager

在csdn上找到了解决方案，如下：（http://blog.csdn.net/swiftshow/article/details/7367733#）

 

1. Remove Network Manager from startup Services.
#chkconfig NetworkManager off

2. Add Default Net Manager
#chkconfig network on

3.Stop NetworkManager first
#service NetworkManager stop

4.and then start Default Manager
#service network start

 

运行完了命令，还会出现

RTNETLINK answers: File exists

RTNETLINK answers: File exists

RTNETLINK answers: File exists

...

然后网络就能用了。