Can we change default ports of nagios agents?

[MSPk]

Hi Team,

We are designing a monitoring platform for a client who wants to migrate to nagios from the existing monitoring tool. There current design has multiple VLANS being used for each Application environment. Client has already opened certain ports for traffic to flow between the tool and the monitored servers and wants nagios to use the same ports for nagio agents to communicate with Nagios XI instance. Please suggest if we can change the Nagios agents (NSClient++, NRPE) default port numbers, if yes, how.

[sreinhardt]

Yes the ports can be changed, you will need to modify the configurations on each of the agent systems, and modify your commands on the nagios server for the port changes.

[Box293]

On your Windows clients running NSClient++, you would alter the nsc.ini file as follows (for version 3.x)

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[NRPE]
;# NRPE PORT NUMBER
;  This is the port the NRPEListener.dll will listen to.
;port=5666

for example to change it to 5667 you would do:

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[NRPE]
;# NRPE PORT NUMBER
;  This is the port the NRPEListener.dll will listen to.
port=5667

Then from your Nagios host, all of the checks will need to be executed with the -p port parameter:

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check_nrpe -p 5667 -H <host address>