In CentOS, I ran the following command. But it doesn't give me explicit errors to investigate. How can I troubleshoot further or find the errors?
service network restart
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If you're using older CentOS, then
service network status is a good place to look, it will show the actual output of the commands used to start the service.
If you're on CentOS 7
journalctl -u network.service is even better, because it will show previous instances as well.