Why does agent_receive_timeout token need increased on my server?

Document ID : KB000013182
Last Modified Date : 14/02/2018
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What does it mean when I get the following error? 

ERROR: did not receive from the agent: please increase 'agent_receive_timeout' token (currently, 2)

Linux or Unix ServerUNAB Agent

The is a timeout value set between the various UNAB threads to do their actions. We have seen client's needing to increase this if they have a busy system where our operations do not complete within the 2 milliseconds. We have also seen a case where the client removed one of the UNAB database files and the time needed to rebuild the file was more than 2 milliseconds.