Error: Connection activation failed: Device not managed by NetworkManager
scenario：安装好rhel6后，reboot后，发现网卡eth0获取不到ip。
service network restart， 有此错误弹出
解决方法：
/etc/init.d/NetworkManager stop
chkconfig NetworkManager off
chkconfig network on
service network restart
其实上面就是将NetworkManager服务停止，并设置成开机不随系统启动，然后设置network服务开机随系统启动！ 重启network服务！
原因：
you have problem because both of NetworkManager and Network using same Network driver and default network blocking access for NetworkManager. if you disable NetworkManager your problem will disappeared after restart
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