Payload length

Icinga Web
1

Hello everybody, i have experience with Icinga 1 - Classic. Now i would like install a new instance of Icinga2. The Icinga2-Server is installed on a Ubuntu 20.4 LTS- System. icinga2 use only the Webapplication “Icingaweb”. Now i would like to monitor Windowsserver with the NSClient++. I added the Windowsserver “Host” and Services successfully completed. The services use the NRPE plugin for monitoring.
The results of Memory, CPU and Disk are completed displayed, but with another output:
“CHECK_NRPE: Invalid packet version received from server.”

I found a solution. Maybe something is wrong with the paket lenght. A value must be set in the configuration file (NSclient). I have change the Value in: payload length=4096. After the change, the NSclient service was allready restarted. The result of the change is that the service now shows a timeout.

CHECK_NRPE STATE CRITICAL: Socket timeout after 10 seconds.

What did I forget to consider here? Thank you for the help. Please excuse my English

2

Hello Antono,
Welcome to the Icinga community. Thanks for joining us.

Are you able to connect to the remote system by using the command line to test?

/usr/lib64/nagios/plugins/check_nrpe -H 1.2.3.4

Is the version of NRPE the same on both the client and the server?

BTW - the NRPE check command is insecure. You should consider using the the newer Icinga check commands that are included in the Icinga2 agent. I also upgraded from Icinga1. The new Icinga2 check command are much better than using the NRPE.

Regards
Alex

3

Hello Alex,

Thank you very much for your assistance. I will try to implement the proposal with the Icinga2-Agent.
In the case of any questions, i will post it here.

So i wish you a happy new here.

Regards

Antono