Just a little tip. I've installed nagios many many times. I still red the docs from beginning to end, for each install. So first things first. Read the docs. Then, start nagios the way you are instructed to start nagios. First, you verify that there are no problems by running
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
. If it complains, then fix those problems. That is what we tried to help you with at the start, but you ignored us, and just tried a new install. Do as you please, but don't ask and then ignore us.
Next start nagios as per the docs. /etc/rc.d/init.d/nagios start
I can tell by your attempts, that you hve skipped the docs, and are triing to install and confiure nagios "from the hip" Please don't . It's a wonderful tool, and you will gain nothing from it, if you don't get intimate with the documentation.