Was just using Facebook a few minutes ago and it was working fine. Went back to it and now I'm getting this error. Same when I go to www.google.ca. The webpages work fine in Internet Explorer, and the problem persists on the Firefox browser of every computer connected to my network. There is no proxy issue, it is set to "No Proxy". Going into Safe Mode doesn't work either. I have rebooted my router, and that also hasn't fixed the problem. There is also no problem with my HOSTS file. Have also attempted to disable my anti-virus and firewall. I cannot find any more solutions online so I've run out of things to try.