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重启网络连接时，报以下错误：
Bringing up interface eth0: Error:Connection activation Failed:Device not managed by NetworkManager解决方法：
1、Remove Network Manager from startup Services. [root@localhost ~]# chkconfig NetworkManager off 2、Add Default Net Manager [root@localhost ~]# chkconfig network on 3、Stop NetworkManager first [root@localhost ~]# service NetworkManager stop 4、and then start Default Manager [root@localhost ~]# service network start 5、然后重新启动网络，可能还会出现以下信息，可以不用管，也可以重启一下电脑主机 RTNETLINK answers: File exists RTNETLINK answers: File exists RTNETLINK answers: File exists
