Some people unable to view my websites
I have a very annoying problem.There are at least 4 people that I know of (probably lots more) that are unable to view my website.
They also can't ping it, or receive mail from it.
I've asked the hosting company (UnitedHosting), and they say there is nothing wrong at their end.
The people that have the problem have also asked their ISPs (which are all different), who also say nothing is wrong.
Does anyone have any ideas why this might be happening?

Thanks
