TCP port check without the Zabbix Agent - ZABBIX Forums
![net-mgmt/zabbix-agent: key net.tcp.listen[port] always returns 0 (not listening), even if service is running on that port · Issue #2333 · opnsense/plugins · GitHub](https://user-images.githubusercontent.com/7350638/114967184-f8d98580-9e41-11eb-9ba8-689cb29cd84c.png "net-mgmt/zabbix-agent: key net.tcp.listen[port] always returns 0 (not listening), even if service is running on that port · Issue #2333 · opnsense/plugins · GitHub")
net-mgmt/zabbix-agent: key net.tcp.listen[port] always returns 0 (not listening), even if service is running on that port · Issue #2333 · opnsense/plugins · GitHub
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net.tcp.service(tcp,<IP>,<port>) simple check not work for most of the ports from GUI - ZABBIX Forums
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Tutorial Zabbix - Monitoring a TCP port [ Step by step ]
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