Useful for many reasons:
tcpdump -i any -n tcp port 10050
Will give you a response of requests on a spcified port 10050. Good to check on what information is being requested.
refs:
https://stackoverflow.com/questions/21532360/zabbix-cant-get-value-from-agent-interrupted-system-call
https://linuxconfig.org/how-to-use-tcpdump-command-on-linux