Nagios Support Forum

HI,
I'm new and need to be pointed in the correct direction.

I have been tasked with setting up a Nagios server that monitors hosts behind a firewall. The Nagious server can not get to the host but the host can SSH and SCP the Nagios server.

I Started with configuring the Host Checks ..

I set up the server to send an SSH External Command "PROCESS_HOST_CHECK_RESULTS;server;0;Server is up" every 60 seconds to the Nagios Server.
with the intent that as long as Nagois gets this message the host is "alive".

I set up the server in Nagios to be
check_interval 0 ; do not preform host checks
active_checks_enabled 0 ; disabled
passive_checks_enabled 1 ; enabled

This works until I stop sending the External Command and the Host is continued to be shown as UP.

This seems simple enough but I can not find any documention on the host checks for host behind a firewall.

Where can I find documention on setting up this type of configuration?

Thanks

You need to set freshness for this check, so tat when the freshness time is surpassed without an incoming passive result, the host will be marked as DOWN. See:
http://nagios.sourceforge.net/docs/3_0/freshness.html