Make sure that you have cleaned up your temporary files, cookies, and history. (open browser, go to Tools, Internet Options and then empty those files) Then close and open a new browser. That will 'sometimes' fix the evil doers that live in the cyber world. Think of all that junk as a bug, like the one that gives you the belly ache.
I get those messages from time to time, too, on this site. I, too, go away and come back to play later. Hope this helps you. I did get the same error on that site that you did. It all hocus pocus, smoke and mirrors anyway. If you stop and think about how the internet works, it is a miracle anything goes anywhere anyway. Remember 20 years ago, 1989, very few people were on computers and even less on the internet and 15 years ago, 1994, more on pcs and a lot more on the internet. Then 10 years ago, remember, we hit the super internet highway - then we crashed! Remember that crash - 1999!
One of things is that your connection isn't from your pc/network provider to this network provider/server. It will get routed through a bunch of network providers and some times one wil be down, but the traffic doesn't get re-routed. It is more cyber stuff that you really want to know about. I am a former pc junkie - they paid me to do that stuff. Now that I am retired - I know what's happening, but I just really don't care!