My Website gives on only Firefox an 521 Code from Cloudflare
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E521 would be a failure connecting to the origin server: https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/#error-521-web-server-is-down
The advice there should help, I recommend checking all Cloudflare IPs are allowlisted + checking origin logs for any errors
The advice there should help, I recommend checking all Cloudflare IPs are allowlisted + checking origin logs for any errors
