Sporadic -97 error"Checkpoint did NOT respond from public monitoring stations"

Document ID : KB000071422
Last Modified Date : 21/02/2018
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I have three public stations that all of my monitors use.  Repeatedly seeing the error, -97 "checkpoint did not respond from two of these stations".  Please explain why we are seeing this constantly?
It may be due to the current load on the public stations being heavy. In this situation, consider adding more stations to the monitor. At a minimum we require 3 public stations per monitor, but we recommend using more and use different stations, to avoid this type of situation.