Error Codes
Related blog posts, guides, and troubleshooting articles from Unknown Proxies.
Related Blog Posts
Cloudflare Error 1101: Worker Threw Exception
Cloudflare Error 1101 means a Worker threw an exception or failed to return a response. Learn causes, debugging steps, and fixes.
Cloudflare Error 1033: Argo Tunnel Error
Cloudflare Error 1033 means a Cloudflare Tunnel cannot be resolved because no healthy connector is available. Learn the causes and fixes.
Cloudflare Error 1005: Access Denied (ASN Banned)
Error 1005 access denied means a Cloudflare site has blocked an ASN. Learn causes, fixes, and how it differs from 1020 and 403.
Cloudflare Error 523: Origin Is Unreachable
Cloudflare Error 523 means Cloudflare cannot reach the origin server. Learn causes, fixes, and how it differs from Errors 521 and 522.
Cloudflare Error 526: Invalid SSL Certificate
Cloudflare Error 526 means Cloudflare rejected the origin SSL certificate. Learn causes, fixes, and how it differs from Error 525.
Cloudflare Error 525: SSL Handshake Failed
Cloudflare Error 525 means the SSL handshake between Cloudflare and the origin failed. Learn causes, fixes, and how 525 differs from 526.
Cloudflare Error 520: Web Server Returned an Unknown Error
Cloudflare Error 520 means the origin returned an unexpected or invalid response. Learn causes, diagnostics, fixes, and how it differs from 521 and 522.
HTTP 429 Too Many Requests: How to Fix Rate Limits
HTTP 429 means too many requests were sent in a short time. Learn what causes 429 errors, how to fix them, and when proxies help.
Cloudflare Error 522: Connection Timed Out
Cloudflare Error 522 means Cloudflare could not complete a TCP connection to the origin server. Learn causes, fixes, and related Cloudflare errors.
Cloudflare Error 521: Web Server Is Down
Cloudflare Error 521 means the origin web server refused Cloudflare's connection or is unavailable. Learn causes, fixes, and related errors.
HTTP 403 Forbidden: Meaning, Causes, and Fixes
HTTP 403 means the server understood your request but refused access. Learn common causes, fixes, and when proxies help.
Cloudflare Error 1015: How to Fix Rate Limited
Cloudflare Error 1015 means you are being rate limited. Learn what causes it, how to fix it, and when better proxies help.
Cloudflare Error 1020: What It Means and How to Fix It
Cloudflare Error 1020 means access denied by a firewall rule. Learn why it happens, how to fix it, and when proxies can help.
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