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Error: Invalid max_attempts, check_interval, retry_interval, or notification_interval value for service '/dev/hda1 Free Space' on host 'remotehost'
Error: Could not register service (config file '/usr/local/nagios/etc/services.cfg', starting on line 56)
***> One or more problems was encountered while processing the config files...
Check your configuration file(s) to ensure that they contain valid
directives and data defintions. If you are upgrading from a previous
version of Nagios, you should be aware that some variables/definitions
may have been removed or modified in this version. Make sure to read
the HTML documentation regarding the config files, as well as the
'Whats New' section to find out what has changed.
the defination of services.cfg.
# Service definition
# Name of service template to use
Not a direct answer to your question but I found it's better to use SNMP over NRPE. I used to use NRPE years ago & then switched SNMP. SNMP comes with more Linux distros; so you don't need to worry about installing just another extra package (NRPE). It's also easy to configure (as far as Nagios is concerned).
Here's copy of my snmpd.conf on client machines (it is used to check disk space, total processes, specific system processes, SNMP uptime & various other things)