Of course, the IP addresses of the performance service should be allowed by this service by default, however, sometimes addresses are accidentally or randomly blocked.
Firewall is blocking the request: if the original server is connected to its own firewall, this can also cause a Cloudflare error.As with an ordinary server without a CDN, this sometimes results in an overload and a timeout when building TCP, if too many requests are to be processed at the same time. For certain requests from browser users (especially dynamic content), the CDN service must nevertheless contact the original server. Overloading the original server: Cloudflare does a lot of work for the original web server running the project.Since the communication between the web server and Cloudflare happens via the internet, an exchange obviously cannot take place. Web server is offline: the HTTP error 522 is often displayed because the contacted web server is offline.The most common reasons for the connection timed-out message are the following: There are various scenarios that can cause a timeout when establishing a TCP connection between the CDN service and the contacted web server. However, as with many similar HTTP errors, it is not so easy to name the source of the error directly. Contrary to what one would initially suspect, the reason for the 522 error occurring is not due to Cloudflare malfunctioning but rather to a server-side problem.
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