Error 520: Web server returning unknown error

Error 520: Web server returning unknown error
0

I’ve tried using the “Get Help” > “Watch a Video” feature to get help on a challenge, and the site is returning Error 520: Web server is returning an unknown error. I’ve found this on the following challenges:

https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript/comparisons-with-the-logical-and-operator
https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript/multiply-two-decimals-with-javascript

Any idea when this issue might be resolved?