Nagios Support Forum

Have you reproduced the issue using the information I provided on 23 February?

Thanks.

It is very simple to run a test to illustrate that nrpe is non-deterministic and does not properly check whether an argument has been passed. I found that nrpe.c does not check the correct string for a "!" to find out whether arguments have been passed. There are two consequences as a resu...

I got the same error i.e. following message was output once or twice: CHECK_NRPE: Receive header underflow - only 0 bytes received (4 expected). when I ran the following command a few hundred times: /usr/lib64/nagios/plugins/check_nrpe -H xxxx -c xxxx -a xxxx I suspect it's caused by a bug in nrpe.c...

When /usr/lib64/nagios/plugins/check_nrpe is run with an argument, if nrpe.cfg contains "dont_blame_nrpe=0", the request should fail and following two messages should be logged: Error: Request contained command arguments, but argument option is not enabled! Client request from was invalid,...

Please get the Developers to investigate what I suspect to be a bug and to provide a fix asap.

Please note that none of our nrpe check commands contain arguments. If fact, there is only one check command (shown in an earlier post). It does not contain arguments. This is an intermittent problem. 99% of the time when the check command is run, the error messages are not logged. The messages are ...

To debug this intermittent problem, I disabled the Nagios command that ran the nrpe check and instead ran it via the command line on the Nagios server host: # while date;do /usr/lib64/nagios/plugins/check_nrpe -H xxxx -c check_success;sleep 1;done Mon Feb 19 14:51:57 AEDT 2018 OK output to stdout by...

Here is a copy of the Nagios server host.cfg file: define host{ use linux-server ; Name of host template to use host_name xxxx alias xxxxxxxxxxxxxxxxx address xxxx check_command check_nrpe!check_success active_checks_enabled 1 notifications_enabled 1 } Here is a copy of the "check_nrpe" co...

We are running nagios-4.3.4-7.el6.x86_64 and nrpe-3.2.0-6.el6.x86_64 (under xinetd). nrpe.cfg contains dont_blame_nrpe=0 The Nagios server frequently checks clients to make sure they are responsive. The same check is done on all clients via nrpe. On some clients, following messages are intermittentl...