osx nrpe: No output returned from plugin

[John Stile]

Recently I tried to setup nrpe monitoring of an osx system by installing
nagios-plugins-1.4.15.tar.gz and nrpe-2.12.tar.gz on osx 10.5, and
locally everything works fine.  This works:
/usr/local/nagios/libexec/check_nrpe -H localhost -c check_users

  USERS OK - 3 users currently logged in |users=3;5;10;0

Next I tried to configure my nagios server (debian sarge with packaged
nagios  1.3-cvs), and from the server command line, this works:
/usr/lib/nagios/plugins/check_nrpe -H mac.my.domain -c check_users

  USERS OK - 3 users currently logged in |users=0;5;10;0

The problem is adding the monitor to /etc/nagios/services.cfg

define service{
       use                             generic-service
       host_name                       mac.my.domain
       service_description             Users
       is_volatile                     0
       check_period                    24x7
       max_check_attempts              3
       normal_check_interval           5
       retry_check_interval            1
       contact_groups                  linux-admins
       notification_interval           120
       notification_period             24x7
       notification_options            w,u,c,r
       check_command                   check_nrpe!check_users
       }

Results in web interface shows:
Status: UNKNOWN
Status Information: 	(No output returned from plugin)

All other nrpe hosts are monitoring well.
I have no other osx nrpe monitored machines as a reference.

Can anyone offer some ideas (other than upgrade)?


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