Objective

The objective is to present the solution for situations when the agent runs without error, but does not start.

Symptom

While trying to run the agent, the command runs without error, but the agent does not start.

When checking the log, the following message appears “service/protocol combination no in /etc/services“.

Solution

In this case you must edit the /etc/services and add the line below:

[root@localhost]# vim /etc/services
nrpe 5666/tcp   #OpMon Agent