Why do I get this gmail every few days, I see my website is still working normally, I check for different browsers, sometimes the browser has error 521, after 10 20 seconds refesh I can enter again. The reason is where
Requests to the following origin have been failing for at least five minutes:
Check out this article from our help center:
Error 521 occurs when the origin web server refuses connections from Cloudflare. Security solutions at your origin may block legitimate connections from certain Cloudflare IP addresses.
The two most common causes of 521 errors are:
- Offlined origin web server application
- Blocked Cloudflare requests