Try to check how long time it takes to run the script from command line
After that - if the time is more than 3 sec and less than 30 sec - you can increase the value of Timeout=30 in configuration file /etc/zabbix/zabbix_server.conf
Don't forget to restart the server after changing any setting in config file.
OK?
Code:
[zabbix]#time show_wan.sh
Don't forget to restart the server after changing any setting in config file.
OK?

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