Bringing up interface eth0: Error:Connection activation failed:Device not managed by NetworkManager
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Just follow the below steps and everything will be ok... 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 来源： 转载地址：http://zvuhj.baihongyu.com/