Issues with websites [View all]

I've tried so many methods to fix this, but it seems every now and then, sites I've been using for a while will not load. It's become more and more of a problem lately. No matter if it's Chrome or Firefox, the site will refuse to load properly. Chrome will give me a ERR_EMPTY_RESPONSE. And Firefox will simply just not load without a reason. I've tried to reset my network, I've cleared caches and browser cookies on both. I even installed Opera and the same issue was happening and that was a fresh install of it. I don't know what else is causing the issue outside of my computer is blocking access to the sites.