Cloudflare (CF) suddenly sends 521 error email? But the site is normal.
Cloudflare (CF) suddenly sent an email warning about a 521 error? However, the site is normalan increase in the number of 521 errors on your source service.
•*.com
[Please check this article from our help center:
•Error 521: The web server has been closed
•Two common causes for 521 errors:
•Your source web server application is offline
•Cloudflare requests are blocked
]
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