monitor any process/service which runs on linux box using nagios

[nagios nagios]

Hi All,

how we can monitor any process/service which runs on linux box using
nagios... i tried using NRPE by deploying on remote host.. but whenever i
tired connecting remote machine  from nagios using check_nrpe it will give
some error  connection refuse .. i followed the instrucation in README file
but some where i missing . please help me on this

root at nagios-server libexec]# ./check_nrpe -H remotemachine -p 5666
Connection refused by host


thanks
manjunath A
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