本文介绍了如何解决在VMware中安装的CentOS 6.4 64位系统重启网络连接时遇到的问题：“Bringing up interface eth0: Error: Connection activation failed: Device not managed by NetworkManager”。解决方案包括禁用NetworkManager服务、激活默认网络管理器等步骤。
VMware中安装的centos6.4 64位，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
2、Add Default Net Manager
3、Stop NetworkManager first
4、and then start Default Manager
Bringing up interface eth0: Error:Connection activation failed:Device not managed by NetworkManager
解决方法：（需要在ROOT下）
1、Remove Network Manager from startup Services.
chkconfig NetworkManager off2、Add Default Net Manager
chkconfig network on3、Stop NetworkManager first
service NetworkManager stop4、and then start Default Manager
service network start5、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
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