I'm having a strange issue that I can't figure out.

I changed hosts a month ago.

I have two users claiming they can't get to my domain at all. They get a "page can't be displayed message."

Normally, I'd chalk it up to user error.

However, based on their IPs, I see they are using the same cable provider (Comcast). They are not showing as identical IPs, but both are Comcast.

I'm not blocking any IPs in my control panel or my htaccess file.

Any thoughts on what I could try to help these guys out?

I've tried everything I can think of: Had them flush their dns, try a different browser, clear their cache, cookies, etc.