Timeout errors from nagios / SNMP

Nagios can be configured to send notifications by various ways and in various formats. If you need to personalize that please refer to your commands.cfg.
This is an example to show you how to receive a short notification by sms using gnokii:

define command{
        command_name    notify-host-by-sms
        command_line    /usr/bin/printf "%.120s" "$HOSTALIAS$ is $HOSTSTATE$" |/usr/local/bin/gnokii --sendsms $CONTACTPAGER$ -r
        }


define command{
        command_name    notify-service-by-sms
        command_line    /usr/bin/printf "%.120s" "$HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$" | /usr/local/bin/gnokii --sendsms $CONTACTPAGER$ -r
        }

The output is like this "hostname is up"

Ok I finally got it working.

The problem was that both nagios servers are performing service checks and reporting results to master node, and all those check were performed perfectly. Master node had service freshness checking so if the monitoring servers could not complete checks master server would scheduled those checks from itself.

Anyways, new servers were on new ip range and by default nrpe port was closed on master server.

Opening the port solved the problem. Although it's still odd that it returned "Service check timed out" instead of "Socket timeout error".