error connection activation failed device not managed by networkmanager or unavailable

서버에 Centos 6.4 를 설치를 했는데 네트워크 연결이 안된다.

IP셋팅 후 

[root@localhost ~]# service network stop

Shutting down interface eth0: Error: Device 'eth0' (/org/freedesktop/NetworkManager/Devices/0) disconnecting failed: This device is not active

[FAILED]

Shutting down loopback interface: Error: Device 'lo' not found.

[FAILED]

Bringing up loopback interface: [ OK ]

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

[FAILED]

해보니 위와 같이 에러가 뜨면서 안된다.

해답은 간단하다

[root@localhost ~]# chkconfig network off

[root@localhost ~]# chkconfig NetworkManager on

해주면 된다.