I recently patched one of our RHEl4 boxes and a strange problem hasnow occurred with check_load plugin. Nagios is generating Unable to read output error.
I ssh'd onto the box as root and ran the check_load plugin manually and returned info fine:
[root@dns2 local]# /usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
OK - load average: 0.00, 0.01, 0.00|load1=0.000;15.000;30.000;0; load5=0.010;10.000;25.000;0; load15=0.000;5.000;20.000;0;
If I do the same and logon as nagios (nrpe user) then I get no output.
I have enabled debug = 1 in the nrpe.cfg file but the only messages I receive are
Oct 31 13:02:02 dns2 nrpe: INFO: SSL/TLS initialized. All network traffic will be encrypted.
Any ideas? I am assuming that some dependency on some external lib's somewhere but I dont know how to debug any deeper than this.