I have this lab architecture.
* One server with Nagios Core installed. That's contains NRPE 3.2.1 (latest) version. I've installed following this instructions: https://support.nagios.com/kb/article/n ... rpe-8.html
* Five Linux servers with samba, glusterfs, nfs... and more. That's already installed NRPE 2.12, works with Nagios Core Server.
* This five hosts can send information to Nagios Core, and Nagios Core can show information of this hosts.
* Nagios Core server cannot check yourself. I get this error message:
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CHECK_NRPE: Receive header underflow - only -1 bytes received (4 expected).
I've tried with Local Area Network IP: 192.168.1.1
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CHECK_NRPE: Receive header underflow - only -1 bytes received (4 expected).
I've tried with localhost
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CHECK_NRPE: Receive header underflow - only -1 bytes received (4 expected).
I've tried with loopback ip (127.0.0.1)
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CHECK_NRPE: Receive header underflow - only -1 bytes received (4 expected).
* I've installed new server with glusterfs with new NRPE (3.2.1), I've tried to connect into Nagios Core and I get:
./check_nrpe -H 192.168.1.1 -n
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CHECK_NRPE: Receive header underflow - only -1 bytes received (4 expected).
* However, I installed NRPE 2.12 version in the new server already added and that's works.
What happend here? How is possible 2.12 version (too old) is works but new version cannot do it.
NRPE 3.2.1 cfg: https://paste.fedoraproject.org/paste/4 ... trV~FG8Lfg
NRPE 2.12 cfg: https://paste.fedoraproject.org/paste/d ... FmvW2WPU2Q