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    ntpd frequency error -648 PPM exceeds tolerance 500 PPM

    ntpd[xxxxx]: frequency error -648 PPM exceeds tolerance 500 PPM

    ntpd
    Some time you will get errors as given below in /var/log/messages file, while troubleshooting about NTP issues. 

     9 Feb 11:39:49 ntpd[19959]: frequency error -653 PPM exceeds tolerance 500 PPM
     9 Feb 11:41:58 ntpd[19959]: frequency error -651 PPM exceeds tolerance 500 PPM
     9 Feb 11:46:12 ntpd[19959]: frequency error -650 PPM exceeds tolerance 500 PPM
     9 Feb 11:49:49 ntpd[19959]: frequency error -650 PPM exceeds tolerance 500 PPM
     9 Feb 11:53:44 ntpd[19959]: frequency error -649 PPM exceeds tolerance 500 PPM
     9 Feb 11:54:48 ntpd[19959]: frequency error -648 PPM exceeds tolerance 500 PPM


    This issue basically refers to following reasons.


    1. You have a problematic source.
    2. NTP offset between ntpd computed time and internal clock is big.

    Workaround:

    the ntpd service should be stopped and the time be adjusted manually with the -qg option :

    # service ntpd stop -- Stop the NTPD first
    # ntpd -qg -- NTPD exits if offset exceeds sanity limit.
    # service ntpd start -- Start the NTP

    Permanent Solution:


    Fix the NTP server




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