Http error

Hi
i am novice inNagios and i have just installed it
i’m monitoring HTTP server on nagios server and i get this error:

HTTP WARNING: HTTP/1.1 403 Forbidden

does somebody know what’s the problem and how to resolve it?
Thanks in advance

on my server it was because I did not have a viable page at that location. Make sure you have an index.html page in your root directory even if all it says is hello world.

you need to use the basic authentication switch for the http check to add the appropriate authentication details, which is in the form “-a username:Password”