Is It Down Right Now website is an easy way to independently verify that the site is down, it's not you or your computer or software. It pings the site and will give a red or green message about the site, and also time it has been down (I don't know how it knows that, or if just based on the last time it was requested to ping the site):

https://www.isitdownrightnow.com/

You can pull it up fast in your browser by just searching for iidrn, it will come right up in results.

I'm still getting the error, but it seems to be corrected MUCH faster than at the beginning of recent events. I sense some corrective coding by the techs to combat aggressive web crawlers.