not able to monitor linux box Connection refused by host

[lntinfo]

i have installed linux nrpe on remote machine after installing i have added that machine in nagiosxi
but not able to monitor i do get error e.g. Connection refused by host

nagios ip is present in /etc/xinet.d/nrpe file

however i am able to monitor those server using SNMP

also, cpu parameter not able to monitor some of the linux servers below error persist:-
CPU Stats Unknown 3m 22s 4/5 2012-05-18 11:51:07 UNKNOWN: iostat not found or is not executable by the nagios user.

[scottwilkerson]

On the remote machine can you run the following to see of it is listening on 5666

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nc -z localhost 5666

If that comes back succeeded, then from your nagios XI server run the following to see if your XI server can reach the remote host on 5666

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nc -z <REMOTE_IP> 5666

[lntinfo]

i think able to communicate to 5666 from both the machine.

return on to terminal without any error.

[scottwilkerson]

It should give return if it is listening, ie

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Connection to localhost 5666 port [tcp/nrpe] succeeded!

Can you run the following and try again

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service xinetd restart

Also, can you post the results of the following command

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ls -l /usr/local/nagios/bin/nrpe

[lntinfo]

i am not getting message like:-
Connection to localhost 5666 port [tcp/nrpe] succeeded!

-rwxrwxr-x 1 nagios nagios 115237 May 18 12:54 /usr/local/nagios/bin/nrpe

[scottwilkerson]

did you try running

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service xinetd restart

[lntinfo]

yes

[scottwilkerson]

After restarting xinetd on the remote machine can you run the following from your XI server

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nc -z <REMOTE_IP> 5666