Could not construct return packet in NRPE handler

[dbsaust]

After upgrade to latest version Received following message from Nagios:
Could not construct return packet in NRPE handler check client side (nsclient.log) logs...

At host end, nsclient++ logged the following:
error:modules\NRPEListener\NRPEListener.cpp:317: Exception handling NRPE packet: Invalid packet version.

[cdienger]

Newer versions of check_nrpe use version 3 by default and nsclient needs version 2. check_nrpe can be configured to use version 2 using the "-2" option. See https://support.nagios.com/forum/viewto ... on#p266038 fro steps.

[dbsaust]

Thanks!
I am not authorized to view this topic:
https://support.nagios.com/forum/viewto ... on#p266038

Kindly assist.

[lmiltchev]

I am not authorized to view this topic:
viewtopic.php?f=16&t=50874&p=266038&hilit=Exception+handling+NRPE+packet%3A+Invalid+packet+version#p266038

Sorry about that! This link was provided by mistake. It's from a customer support forum. There is not so much in the thread though - it was just mentioned that depending on the version of the NSClient++, v3 packets may or may not be supported. What is the version of the NSClient++ agent that you are currently using?

Have you tried adding the "-2" option to your check to see if this is going to solve your problem?

Example:

Code: Select all

./check_nrpe -2 -H <ip address> -c <command> -a <arguments>

[dbsaust]

Hi @lmiltchev,
NSClient++ Version 2, June 1991
Kindly provide us the full command that we need to execute. Host IP address is 10.215.222.75

Also, is there anything else we need to try if this wouldn't work?

Thanks again!

[lmiltchev]

NSClient++ Version 2, June 1991

This is a VERY old version of NSClient++, which won't work with the NRPE v3. You will need to upgrade your NSClient++ agent.

Kindly provide us the full command that we need to execute. Host IP address is 10.215.222.75

I wouldn't know what kind of command you would like to execute, in order to provide you with the "full command"...

The correct syntax would be:

Code: Select all

/usr/local/nagios/libexec/check_nrpe -2 -H 10.215.222.75 -c <command> -a <arguments>

where you substitute <command> with the actual command as defined in the NSClient++ config (NSC.ini or nsclient.ini, depending on the version), and <arguments> with the actual arguments that you are passing.

Note: Passing arguments is optional, depending on how the command is defined. Arguments could be "hard-coded".

[dbsaust]

Thank you for your suggestion!
We will upgrade to latest NSClient++ and after that try again

Cheers!

[lmiltchev]

Let us know if you have any further questions. Thanks!