Connection to one site

Hi,

I am very very confused to why i cant access or even ping one site, i know its up and running as everyone i know can access it.

I cant ping it, i cant ping the ip address i cant get on it using a browser.

I have shutdown the pc, reset router, ran ipconfig /renew

everything i can think of, its just this one site and the worst thing is im the owner, its not the hosting as ive checked to make sure im banned from my own server 🙂

Any ideas?