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Periosically get xntpd message synchronisation lost, should I be concerned?

 
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Jack C. Mahaffey
Super Advisor

Periosically get xntpd message synchronisation lost, should I be concerned?

I periodically get 'synchronisation lost' logged by xntpd. Should I be concernted?

jack...
7 REPLIES 7
Sanjay_6
Honored Contributor
Solution

Re: Periosically get xntpd message synchronisation lost, should I be concerned?

Hi Jack,

As long as the system sync back to the ntp server the sync lost message is okay. Depends on the frequency of this message.

Hope this helps.

Regds
Christopher McCray_1
Honored Contributor

Re: Periosically get xntpd message synchronisation lost, should I be concerned?

I too get those messages from time to time:Jan 6 14:29:25 dmc29 xntpd[918]: synchronisation lost
Jan 6 14:34:30 dmc29 xntpd[918]: synchronized to 1.2.3.4, stratum=3


You need worry only if you don't get the second message or if the messages flood your syslog.

Hope this helps
Chris
It wasn't me!!!!
James R. Ferguson
Acclaimed Contributor

Re: Periosically get xntpd message synchronisation lost, should I be concerned?

Hi Jack:

Yes and no.

If you do 'ntpq -p' the output contains a column titled "offset". This is the number of milliseconds difference between your server's clock and the time source. Technical Knowledge Base document #KBRC00001347 notes that "When this number exceeds 128 then NTP makes a big adjustment (and the message synchronization lost appears in the logfile)."

Regards!

...JRF...
Jack C. Mahaffey
Super Advisor

Re: Periosically get xntpd message synchronisation lost, should I be concerned?

I'll also get the second message, it just doesn't flood syslog. It's happens only maybe 10 - 30 times a day.

The second message, for example, "synchronized to nn.nn.nn.nn, stratum=14" may not show up for another 5 or 10 minutes later.

jack...
John Payne_2
Honored Contributor

Re: Periosically get xntpd message synchronisation lost, should I be concerned?

You are problibly ok...

If you are worried about seeing what kind of jump your server is making, enable the 'driftfile' option. It is listed close to the top of the docs in the ntp.conf file.
Spoon!!!!
Jack C. Mahaffey
Super Advisor

Re: Periosically get xntpd message synchronisation lost, should I be concerned?

ntpq -p offset is only around 28, well below 128.

Thanks to all for the feedback.

jack...
T. M. Louah
Esteemed Contributor

Re: Periosically get xntpd message synchronisation lost, should I be concerned?

To add to above,
If you are not supposed to be sysncing Time with a Time Server (NTP network time Protocol) you'd probably not to worry.
.. Check Date & time of ur system.
.. Check the battery of real time clock (rtc), it may be low & You lost time when powered off for long time.
G'd luck
t++
Little learning is dangerous!