I've suddenly lost complete access to a particular website. Every browser on both of my machines (a Windows laptop and an iMac running OS X) display a ‘Cannot connect/No server found’ error.
Meanwhile, Down For Everyone Or Just Me says that the website is up and that it's just me; on top of this, it opens fine in Mobile Safari on an iPhone that is connected to the same WiFi network.
I've tried rebooting the machines and restarting the router, but nothing has fixed the problem. What could possibly be the reason for this weird behaviour?