Nagios Support Forum

There are few different ways a Solaris box can have it's ports locked down. You can refer to the following link on dealing with the most common firewall on Solaris, ipfilter.
http://docs.oracle.com/cd/E19253-01/816 ... index.html
Your mileage may vary. You Unix admin may be right, as most Solaris installs default to "no firewall". Is the nrpe daemon started on the Solaris box? Is there a router/firewall between the two? You could always try nmapping the Solaris box locally to make sure it is not another firewall causing the problems.

I added a line in /etc/services "nrpe 5666/tcp # Nagios Client".

Now when I do a "nmap [host ip address] -p 5666" command it tells me that the STATE of the port is "filtered". What does that mean?

Thanks

Th the means the port is closed or a firewall between the XI box and the remote host is filtering the port. What happens when you run nmap on the remote host?

On the remote solaris box:

There is no Firewall in between these two machines, they are in the same network. the monitored host machine does not support "nmap" command. Can I install nmap on this solaris machine?

According to Solaris when /etc/ipf/ipf.conf is empty or no entries, it is the same as "all ports are open" on the machine, is this correct. The ipf.conf is empty on this machine.

Thanks,

Gus.

You can also use "telnet" to test the port on the solaris box as it looks like nmap must most likely be compiled from source.