when we face this error in nagios and nagios shows server warning as LOAD then we need to try to connect the server having issue from nagios. If the below error we get we need to add 5666 port in csf.conf from the server with issue and also we need to restart csf.
CHECK_NRPE: Socket timeout after 10 seconds
you need to run the command from the nagios server to check if it can connect to server with issue.
/usr/local/nagios/libexec/check_nrpe -H SERVERIP -c check_load
simmylinux 