CDN Errors

Error 1015 You Are Being Rate Limited means Cloudflare temporarily blocked access because too many requests were made in a short period. Cloudflare’s official documentation says this happens when the website owner has configured rate limiting rules that restrict how many requests a visitor can make in a given time period. :contentReference[oaicite:0]{index=0} This is not

Error 1033 Argo Tunnel Error means Cloudflare cannot find a healthy tunnel connector to receive traffic for the hostname. Cloudflare’s official documentation states that a 1033 error appears when the tunnel is not connected to Cloudflare’s network because Cloudflare cannot find a healthy cloudflared instance to receive the request. :contentReference[oaicite:0]{index=0} This is not a normal

Error 1020 means Cloudflare blocked the request with a firewall rule before it reached your server Cloudflare Error 1020 Access Denied means Cloudflare blocked a request based on a firewall rule. The request never reached your origin server. This is not downtime. It is a security rule doing exactly what it was configured to do.

Error 526 means the CDN connected to the origin but rejected the SSL certificate as invalid Error 526 Invalid SSL Certificate means the CDN connected to your origin server but rejected the SSL certificate as invalid. The secure connection fails during certificate validation. This error appears only when strict SSL validation is enabled. The problem

Last tested: October 22, 2026 · By Alex Error 525 SSL Handshake Failed means the CDN could not establish a secure HTTPS connection with your origin server. The encryption handshake fails before any content is delivered. This happens between the CDN and your server — not in the user’s browser. The root cause is almost

Error 524 Timeout Occurred means the CDN successfully connected to your origin server, but the server did not finish processing the request in time. The connection works. The server responds. It is simply too slow. Quick Fix Check CPU and memory usage on the origin server. Restart web server and PHP services. Identify long-running database

Error 523 Origin Is Unreachable means the CDN cannot reach your origin server at all. The network connection fails before any response is received. This is a connectivity issue. It usually points to DNS errors, incorrect IP configuration, firewall blocks, or server downtime. Quick Fix Verify your server is online and reachable via its IP

Last tested: October 22, 2026 · By Alex Error 520 Unknown Error means the CDN received an unexpected or empty response from the origin server. The connection succeeds, but the reply is invalid. This error is vague by design. It signals that something broke between your server and the proxy layer. The fix requires systematic