Nagios Support Forum

Posted: **Tue Sep 29, 2020 11:24 pm**

After upgrade to 5.7.3 we are having issues with check_nrpe.
It is causing all NSClient service output to show up as OK - CHECK_NRPE: Invalid packet version received from server

Prior to upgrade check_nrpe v3.2.1

Code: Select all

[nagios@myucbrnagiapp05 libexec]$ ./check_nrpe_v3  -H  10.104.28.46
I (0.5.2.39 2018-02-04) seem to be doing fine...

[nagios@myucbrnagiapp05 libexec]$ ./check_nrpe_v3 -2 -H  10.104.28.46
I (0.5.2.39 2018-02-04) seem to be doing fine...

After upgrade to check_nrpe 4.0.1 XI 5.7.3

Code: Select all

[nagios@myucbrnagiapp05 libexec]$ ./check_nrpe_v3  -H  10.104.28.46
I (0.5.2.39 2018-02-04) seem to be doing fine...
[nagios@myucbrnagiapp05 libexec]$ ./check_nrpe -H  10.104.28.46
[b]CHECK_NRPE: Invalid packet version received from server.[/b]
I (0.5.2.39 2018-02-04) seem to be doing fine...
[nagios@myucbrnagiapp05 libexec]$ ./check_nrpe -2 -H  10.104.28.46
I (0.5.2.39 2018-02-04) seem to be doing fine...
[nagios@myucbrnagiapp05 libexec]$ ./check_nrpe -3 -H  10.104.28.46
[b]CHECK_NRPE: Invalid packet version received from server.[/b]
I (0.5.2.39 2018-02-04) seem to be doing fine...

Posted: **Wed Sep 30, 2020 4:45 pm**

Hi @rajasegar,

We've updated the NRPE to version 4 and the packet type was updated as well. However, you can set the check command for these services to use version 2 packet types.

The steps are covered in the following guide.

NRPE - Remote does not support Version 3 Packets

Let me know if that resolves the issue for you.

Benjamin

Posted: **Wed Sep 30, 2020 8:20 pm**

benjaminsmith wrote:Hi @rajasegar,

We've updated the NRPE to version 4 and the packet type was updated as well. However, you can set the check command for these services to use version 2 packet types.

The steps are covered in the following guide.

NRPE - Remote does not support Version 3 Packets

Let me know if that resolves the issue for you.

Benjamin

Are you telling me check_nrpe version 3.2.1 defaults to 3 and falls back to 2 without any error message?
We moved to 3 due to the vunerablities related to v2.

How to force NSClient to use v3 communications?

Posted: **Thu Oct 01, 2020 3:56 pm**

Hi,

This is explained further in the following guide but this setting is related to the packet size required by NSClient.

NRPE - Packet Size Explained

We are not the developer of NSClient but we have taken steps to ensure compatibility so you can continue to use this agent with the new versions of NRPE.

--Benjamin

Posted: **Thu Oct 01, 2020 9:25 pm**

benjaminsmith wrote:Hi,

This is explained further in the following guide but this setting is related to the packet size required by NSClient.

NRPE - Packet Size Explained

We are not the developer of NSClient but we have taken steps to ensure compatibility so you can continue to use this agent with the new versions of NRPE.

--Benjamin

Thanks. Please close the thread

Posted: **Fri Oct 02, 2020 8:18 am**

rajasegar wrote:
benjaminsmith wrote:Hi,

This is explained further in the following guide but this setting is related to the packet size required by NSClient.

NRPE - Packet Size Explained

We are not the developer of NSClient but we have taken steps to ensure compatibility so you can continue to use this agent with the new versions of NRPE.

--Benjamin
Thanks. Please close the thread

Great!

Closing thread

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