Why does error message "the NTP socket is in use, exiting" occurs while excuting ntpdate command ?

Solution Verified - Updated -

Issue

  • While trying to sync time from a time server using ntpdate, it throws below error message:
# ntpdate x.x.x.x
13 Mar 18:23:32 ntpdate[31778]: the NTP socket is in use, exiting
  • What does above error message means and how to resolve issue ?

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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