iptablesTotal 1 article
Firewall setting error will trigger Cloudflare 521 error? -Photonflare.com | WordPress repair service, worldwide, fast response!

Can an incorrect firewall setting trigger a Cloudflare 521 error?

Analyzes whether the firewall configuration causes Cloudflare to return a 521 error, and provides advice on the correct settings and troubleshooting for UFW and iptables.