I'm having problem with NRPE parameters while testing a new Nagios installation. Header Node is running RHEL AS4 U6, and Nagios v3.2.0 Client is running RHEL AS4 U4, and NRPE v2.12 (compiled with command arguments, and with dont_blame_nrpe=1) Standard hardcoded nrpe disk checks work fine, for example; Service definition on Header Node - check_nrpe!check_home Relates to the following in nrpe.cfg on the Client - command[check_home]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /home and returns - DISK OK - free space: /home 1878 MB (98% inode=99%);| /home=34MB;1612;1813;0;2015 Using variables, I can get the correct results from the command line; Service definition on Header Node - check_nrpe!check_adisk!20%!10%!/opt Relates to the following in nrpe.cfg on the Client - command[check_adisk]=/usr/local/nagios/libexec/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$ and I can enter this on the Header Node - #../../libexec/check_nrpe -H <client> -c check_adisk -a 20 10 /opt DISK OK - free space: /opt 432 MB (45% inode=97%);| /opt=524MB;987;997;0;1007 However, this does not work within Nagios GUI, all the parameters passed are blank. I see this in syslog on the Client - Added command[check_adisk]=/usr/local/nagios/libexec/check_disk-w $ARG1$ -c $ARG2$ -p $ARG3$ Handling the connection... Host is asking for command \'check_adisk\' to be run... >>>>>Running command: /usr/local/nagios/libexec/check_disk -w -c -p Command completed with return code 3 and output: Unknown argument Usage: check_disk -w limit -c limit [-W limit] [-K limit] {-p path | -x device} [-C] [-E] [-e] [-g group ] [-k] [-l] [-M] [-m] [-R path ] [-r path ] [-t timeout] [-u unit] [-v] [-X type] Return Code: 3, Output: Unknown argument Usage: check_disk -w limit -c limit [-W limit] [-K limit] {-p path | -x device} [-C] [-E] [-e] [-g group ] [-k] [-l] [-M] [-m] [-R path ] [-r path ] [-t timeout] [-u unit] [-v] [-X type] I'm conscious that I'm probably doing something very trivial wrong, but can't get my head around why this should work on the command line, and not via the GUI. Any help much appreciated. Regards Nigel Nigel Leach Grid Engineer | Front Office Risk Systems | BNP Paribas