Hi all, disclaimer: I'm new here and new to Nagios, so please bear with me. I've searched and tried all lists, faq and whatnot to manage on my own, but to no avail. My goal (for now) is to make a dead simple nagios install: Server A runs nagios, does some basic localhost checks Server B runs nrpe daemon Server A runs a check_load command on Server B thorough nrpe I have done two separate installations from source on two different sets of servers, running on different networks and SuSE 10.1/9.2 in one case, Debian Unstable/Gentoo in the other. The error is identical on both sets of servers, so I have concluded it is not a OS related problem. Yes, you probably guessed it, it is the oh so common "Warning: Return code of 127 for check of service 'CPU Load' on host 'gerald' was out of bounds. Make sure the plugin you're trying to run actually exists.". Ok, so here are some details ("helena" is Server A, where nagios runs; "gerald" is Server B, where the nrpe daemon runs). All commands are run as the "nagios" user. nagios@helena:/$ /opt/nagios/libexec/check_nrpe -H localhost returns "NRPE v2.8.1" just as it should nagios@helena:/$ /opt/nagios/libexec/check_nrpe -H gerald -c check_load returns a correct reply and I can see the two servers speaking by doing a tail -f /var/log/syslog on Server B: May 16 18:15:42 gerald nrpe[20766]: Connection from <a href="http://192.168.1.10">192.168.1.10</a> port 29830 May 16 18:15:42 gerald nrpe[20766]: Host address is in allowed_hosts May 16 18:15:42 gerald nrpe[20766]: Handling the connection... May 16 18:15:42 gerald nrpe[20766]: Host is asking for command 'check_load' to be run... May 16 18:15:42 gerald nrpe[20766]: Running command: /opt/nagios//libexec/check_load -w 15,10,5 -c 30,25,20 May 16 18:15:42 gerald nrpe[20766]: Command completed with return code 0 and output: OK - load average: 0.01, 0.01, 0.00|load1=0.010;15.000;30.000;0; load5=0.010;10.000;25.000;0; load15=0.000;5.000;20.000;0; May 16 18:15:42 gerald nrpe[20766]: Return Code: 0, Output: OK - load average: 0.01, 0.01, 0.00|load1=0.010;15.000;30.000;0; load5= 0.010;10.000;25.000;0; load15=0.000;5.000;20.000;0; May 16 18:15:42 gerald nrpe[20766]: Connection from <a href="http://192.168.1.10">192.168.1.10</a> closed. So, am I correct in assuming that nrpe is correctly running and functioning on both servers? In this case the nrpe daemon is running as a stand-alone daemon, but results are exactly the same when running under xinetd on the SuSE servers (first set of servers). When I launch nagios as a foreground process I see something interesting on the console: root@helena:~/custom_compiles/nrpe-2.8.1# /opt/nagios/bin/nagios /opt/nagios/etc/nagios.cfg Nagios 2.9 Copyright (c) 1999-2007 Ethan Galstad (<a href="http://www.nagios.org">http://www.nagios.org</a>) Last Modified: 04-10-2007 License: GPL Nagios 2.9 starting... (PID=5406) !! sh: line 1: /opt/nagios/libexecHOSTADDRESS$: No such file or directory Warning: Return code of 127 for check of service 'CPU Load' on host 'gerald' was out of bounds. Make sure the plugin you're trying to run actually exists. !! sh: line 1: /opt/nagios/libexecHOSTADDRESS$: No such file or directory Warning: Return code of 127 for check of service 'CPU Load' on host 'gerald' was out of bounds. Make sure the plugin you're trying to run actually exists. See those errors from sh? The command line seems to have been stripped of the actual command and the $HOSTADDRESS$ macro lacks the leading "$"... Now, who/what is doing this to the command? I've checked and double checked my config files and believe they're correct. The relevant bits follow: commands.cfg: define command{ command_name check_nrpe command_line $USER1/check_nrpe -H $HOSTADDRESS$ -c $ARGS1$ } nrpe.cfg (on Server B, "gerald"): command[check_load]=/opt/nagios/libexec/check_load -w 15,10,5 -c 30,25,20 resource.cfg: $USER1$=/opt/nagios/libexec gerald.cfg: define host{ use linux-server host_name gerald alias gerald address <a href="http://192.168.1.200">192.168.1.200</a> } define service{ use generic-service ; Name of service template to use host_name gerald service_description CPU Load check_period 24x7 ; The service can be checked at any time of the day max_check_attempts 600 ; Re-check the service up to 4 times in order to determine its final (hard) state normal_check_interval 2 ; Check the service every 5 minutes under normal conditions retry_check_interval 1 ; Re-check the service every minute until a hard state can be determined contact_groups admins ; Notifications get sent out to everyone in the 'admins' group notification_options w,u,c,r ; Send notifications about warning, unknown, critical, and recovery events notification_interval 360 ; Re-notify about service problems every hour notification_period 24x7 ; Notifications can be sent out at any time check_command check_nrpe!check_load } As you can see not much have been changed from the basic installation instructions. Ideas anyone? :-( How can I configure nagios to provide more leads (debug info) than that miserable sh error above? Is the debug_file (and related) options a 3.0-only option? (<a href="http://nagios.sourceforge.net/docs/3_0/configmain.html#debug_file"> http://nagios.sourceforge.net/docs/3_0/configmain.html#debug_file</a>)