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In order to sync time using NTP in centos server normally you will have to have these basic settings in /etc/ntp.conf

server #Public server
server #Public Server
server #Optionally you can choose one of yours as central
server #Optional (assuming one of the local server)

restrict mask # restrict from making changes
restrict mask # restrict any server making changes

/etc/init.d/ntp stop && ntpdate # Assuming 84.X… is ntp server
service ntpd stop && ntpdate # Assuming 84.X… is ntp server

In order to ensure things are working well firewall port should be opened if there is any firewall inbetween. (NTP port is 123)