Local firewall changes on Nagios core server

I have setup a Nagios server on RHEL 5 and it has the local firewall “ON”. What exactly are the changes required on the local firewall so that Nagios core server is able to accept reports from NRPE and NSClient++ agents. I don’t see a fixed port used by Nagios core.

Thanks

sorry, can’t resist…

lmgtfy.com/?q=nagios+nrpe+port

nsclient has config files where you set the port to be used…