How to find out why a node is "Down"?

I know PBS has logs in many locations, but I keep forgetting which log has info. on why a node is down.

Please check the server logs, when the node goes does ( status = down)

source /etc/pbs.conf
check $PBS_HOME/server_logs/YYYYMMDD

Sample server log :
12/16/2020 21:50:28;0002;Server@openpbs;Node;;node down: communication closed

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