Nagios Support Forum

ssax wrote:It only looks like you have one server defined and it can't connect to the others, do you have any additional server's that you can add that are also reachable? You may want to comment out the defaults:

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#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst

Then restart NTP:

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service ntpd restart

That means that if NTP syncing fails for your defined server then it has no backup servers to try, maybe that is why you are receiving that message.