I'm checking a website for http service. Several times it's notified me that the website has failed. When I navigate to the website, it appears to be working fine. But, Simon says it still hasn't recovered. When I look at the source or the preview it shows that the server can't be found. But when I 'go to site' it looks fine. But, Simon still tells me that it has a failure.

I don't know why I'm getting these failures - but even if they are legit, why won't it recover?

Thanks!