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Established TCP Connections or TCP/UDP Listeners

Distribution: official part of Check_MK
License: GPL
Supported Agents: Linux, AIX

This check evaluates the output of the netstat command on Linux and AIX and checks if there are established connections or listeners matching a given criteria.

The check returns OK state if the specified connection/listener is present, and CRIT if not.

This check needs the agent plugin netstat.linux or netstat.aix to be installed.


A user defined identifier of the connection.


No discovery supported.