Error in configuration of host



I am new to Nagios, I need help to solve following problem

I have a question, I configured a host in nagios tool, created the template for it too.
the Status of host is still showing DOWN.

Status information ---- (Host Check Timed Out)

It works fine when I ping the host through nagios tool.

Where did I go wrong…

Please help me


the status informaton is coming out to be

“UNKNOWN: Received noSuchName(2) error-status at error-index 1.”