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/etc/ntp.conf

How do I configure an NTP (Network Time Protocol) client or server under CentOS / RHEL / Fedora Linux to manage the system clock over a network?
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BIND: Clocks are Unsynchronized Error and Solution

Q. I've configured BIND named TSIG as documented here. It worked for some time, but my /var/log/messages got the errors as follows:

zone example.org/IN: refresh: failure trying master 71.22.11.22#53 (source 0.0.0.0#0): clocks are unsynchronized: 9 Time(s)
zone example.org/IN: refresh: failure trying master 71.22.11.22#53 (source 71.22.11.22#0): clocks are unsynchronized: 9 Time(s)

How do I fix these errors under Debian Linux 64 bit etch server?
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Q. How do I install and configure NTP ( Network Time Protocol ) daemon to keep my dedicated servers clock in sync?
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How do I install and configure NTP under CentOS Linux version 5.x or 6.x server to synchronize the system clock?
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