My websites are returing ERR_EMPTY_RESPONSE

I’ve just pulled your comments together to keep things clean, and so all the information is in one place. Since you’ve also added more information about how long you’re site has been running. Do you get any errors on your dashboard? That said, it looks like both your site & bikerman’s may be on the same IP address. so there may be something going on with the servers. We’ll have to wait for admin to be on to be sure.