[ntp:questions] ARRGH!!! I woke up to a 50 SECOND clock error.

David J Taylor david-taylor at blueyonder.co.uk.invalid
Tue Mar 13 20:27:53 UTC 2012

"Ron Frazier (NTP)" <timekeepingntplist at c3energy.com> wrote in message 
news:4F5F9233.1080204 at c3energy.com...
> The question is, what reset my clock abruptly 50 seconds off at around 
> 0637 UTC.

I would suspect your GPS.

> My loopstats file shows that the GPS was humming along quite nicely at 
> that point with no anomalies at all.  I don't believe it's the cause of 
> the problem.  It looks like NTPD abruptly decided to step my clock 50 
> seconds, for reasons unknown.  As far as I know, NTPD is the only thing 
> active on the system that will alter the clock.  The Windows internet 
> time function is disabled.  The noselects are there for testing only.  I 
> won't keep them there permanently.  I'm trying to determine where these 
> anomalous readings are coming from.
> Sincerely,
> Ron

Yes, I appreciate you are testing, but I think you are testing the wrong 
way round (in view of the results).  Lock your PC as best you can to the 
Internet servers, and watch the GPS with "noselect" against it.


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