In most cases this is caused by the origin server or network. Ensure that all Cloudflare IPs are allowlisted so they don’t trigger any rate limit or similar.
Error
Try the suggestions in this Community Tip to help you fix Error 522 “ERR CONNECTION TIMED OUT” in Google Chrome or “The connection has timed out” in Firefox.
Background
A 522 error happens when a TCP connection to the web server could not be established. This typically happens when Cloudflare requests to the origin (your webserver) get blocked. When this happens, you’ll see “ERR_CONNECTION_TIMED_OUT”.
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Quick Fix Ideas
Make sure that you’re not blocking Cloudflare IPs in .hta…