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1) The clocks must be within 600 seconds (10 minutes). The idea is that you set the clock by your wristwatch to get "close enough" and then use ntpdate to actually set the time.
2) Mostly, you must have connectivity from your client to the NTP server; firewalls opened for port 123; and the NTP server must be allowed to send time to the client and the client must be allowed to receive the time. This is what all those nasty restrict lines in /etc/ntp.conf are for.11
Thanks a lot for your answer. I would a query for the first point as below:
1) I have a query that I have not seen this figure of 600 seconds documented anywhere, please share the link or some other way so that I can get more insight into it.
Request you to please revert.