CHECK_NRPE: No output returned with check_iptables.sh script

[Kaplan, Andrew H.]

Hi there --

I am running the check_iptables.sh script on one of our clients, and while the
script presents output whenever it is
manually run on the server with the firewall, this output is not being
transmitted to the Nagios server. The error message 
that I am encountering is the following:

CHECK_NRPE: No output returned from daemon.  

The check_iptables.sh script is located in the /usr/local/nagios/libxec
directory, and has been added as a definition to 
the /usr/local/nagios/etc/commands.cfg file with the syntax shown below:

# 'check_iptables.sh' command definition
define command{
        command_name    check_iptables
        command_line    /usr/local/nagios/libexec/check_iptables.sh
        }

The definition for check on the Nagios server has been added to the
/usr/local/nagios/etc/objects/services.cfg file
with the following:

# Service definition
define service{
        use                             generic-service         ; Name of
service template to use

        host_name                       <hostame>
        service_description             Check IP Tables
        is_volatile                     0
        check_period                    workhours
        max_check_attempts              4
        normal_check_interval           5
        retry_check_interval            1
        contact_groups                  linux-admins
        notification_interval           960
        notification_period             workhours
        check_command                   check_nrpe!check_iptables
        }

The check_iptables.sh script has been added to the /usr/local/nrpe/libexec
directory on the client, and the definition
of the check shown below is included in the client's nrpe.cfg file:

command[check_iptables]=/usr/local/nrpe/libexec/check_iptables.sh

The client system is situated outside the company filewall in a DMZ, and
connections are made through the firewall
via an SSH connection. There are several other services that are monitored by
the Nagios server, and the output from
their respective chceks are getting through to the Nagios server.

The NRPE client is version 2.6, while the Nagios server is running the 3.1.2
release. I checked the nagios.log and 
messages log files, but I did not see any errors relating to the script. What
other step(s) do I need to take in order 
for the output that is generated on the client be transmitted to the server?
Thanks.



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