[email protected]:~$ sudo -s
[sudo] password for dengpei: 
[email protected]:~# service network-manager
Usage: /etc/init.d/network-manager COMMAND
[email protected]:~# service network-manager stop
network-manager stop/waiting
[email protected]:~# service network-manager start
network-manager start/running, process 1918

[email protected]:~# service network-manager stop
network-manager stop/waiting
[email protected]:~# rm /var/lib/NetworkManager/NetworkManager.state 
[email protected]:~# service network-manager start
network-manager start/running, process 1951
[email protected]:~#