<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7654.12"> <TITLE>CHECK_NRPE: No output returned with check_iptables.sh script</TITLE> </HEAD> <BODY>  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. The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.</BODY> </HTML>