"Plugin timed out while executing system call" error using check_dhcp plugin

[Ruth Anne]

Nagios version 2.8
check_dhcp (nagios-plugins 1.4.6) 1.8
RHEL4-x64

We finally made this plugin work with our server - we had to issue 
addresses on a range we had not previously set up. The command 
/usr/local/nagios/libexec/check_dhcp -s <our.server.IP.here> works 
splendidly from the command line with both root and nagios users. 
'/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg' 
completes with no errors.

However, when I attempt to have check_dhcp run from within nagios, I 
get the error: CRITICAL - Plugin timed out while executing system 
call.

Previous to this error, I was getting "DHCP;CRITICAL;HARD;3;(Return 
code of 126 is out of bounds - plugin may be missing)" errors.  I 
followed Thomkas' suggestion in a message dated Mon, 11 Sep 2006 
04:41:53 +0200, and removed the service definition, restarted nagios, 
inserted the service definition, and restarted nagios.  Then I started 
to get the "Plugin timed out" errors.

I had had someone else look over the files, and they can't find any 
errors.  I am including the relevant snippits here.  Hopefully,
someone will be able to shed some light on my problem.

Thanks,
--Ruth Anne


ls -l of check_dhcp:
-rwsr-xr-x  1 root root  87240 Mar 22 11:49 check_dhcp

from hostgroups.cfg:

define hostgroup{
         hostgroup_name  dhcp-servers
         alias           DHCP Servers
         members         pod-e,pod-f
         }


from services.cfg:

define service{
      use     generic-service
      hostgroup_name      dhcp-servers
      service_description      DHCP
      is_volatile      0
      check_period      24x7
      max_check_attempts      3
      normal_check_interval      5
      retry_check_interval      1
      contact_groups      nagios-admins
      notification_interval      30
      notification_period      24x7
      notification_options      w,u,c,r
      check_command      check-dhcp-lrt
      }

from commands.cfg

#
# 'check-dhcp-lrt'command definition
define command{
         command_name    check-dhcp-lrt
         command_line    $USER1$/check_dhcp -s $HOSTADDRESS$
         }


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