Cloudflare Errors
Cloudflare acts as a reverse proxy and CDN for millions of websites. When things go wrong, it displays specific error codes (often in the 1000 range) or branded 5xx error pages. These errors help distinguish whether the problem lies with Cloudflare's edge network, the user's connection, or the origin web server.
Dealing with Cloudflare Errors can be frustrating, but they are often just the system's way of telling you exactly what went wrong. These errors are specific to the underlying technology or platform. They require a deep understanding of the specific software's configuration and logs. In this section, we break down each error code into simple, actionable steps for both casual users and system administrators.
Errors in this Category
Error 521 Web Server Is Down
This is a Cloudflare-specific error indicating that the origin web server refused the connection fro...
Error 522 Connection Timed Out
This Cloudflare error happens when Cloudflare could not establish a TCP connection to the origin ser...
Web Server Returns an Unknown Error
Error 520 is a catch-all response from Cloudflare when the origin server returns something unexpecte...
Origin Is Unreachable
Error 523 occurs when Cloudflare cannot contact your origin web server. This is different from a tim...
A Timeout Occurred
Error 524 indicates that Cloudflare made a successful TCP connection to the origin server, but the s...
SSL Handshake Failed
Error 525 indicates that the SSL handshake between Cloudflare and the origin web server failed. This...
Invalid SSL Certificate
Error 526 occurs when Cloudflare is set to 'Full (Strict)' SSL mode, but the origin server's SSL cer...
Access Denied
Error 1020 Access Denied is a Cloudflare error that appears when a firewall rule violates the reques...
DNS Points to Prohibited IP
Error 1000 indicates that the DNS records for a Cloudflare-proxied domain are pointing to a Cloudfla...
You Are Being Rate Limited
Error 1015 indicates that the site owner has implemented rate limiting rules on their Cloudflare acc...
Origin DNS Error
Error 1016 Origin DNS Error occurs when Cloudflare attempts to connect to your origin server but can...
Argo Tunnel Error
Error 1033 indicates that the Cloudflare Argo Tunnel (now Cloudflare Tunnel) has failed. The cloudfl...
Railgun Listener to Origin Error
Error 527 indicates an interrupted connection between Cloudflare and the origin's Railgun server (rg...
Worker Threw Exception
Error 1101 indicates that a Cloudflare Worker (serverless script) threw a JavaScript exception durin...
CNAME Cross-User Ban
Error 1014 CNAME Cross-User Ban occurs when a CNAME record in one Cloudflare account points to a dom...
DNS Resolution Error
Error 1001 indicates that Cloudflare could not resolve the origin web server's hostname. This is sim...
Access Denied: Country or Region Banned
Error 1009 Access Denied indicates that the owner of the website has explicitly banned your country ...
Worker CPU Time Limit Exceeded
Error 1102 indicates that a Cloudflare Worker script exceeded the CPU time limit allocated to it. Cl...
Worker Memory Limit Exceeded
Error 1104 indicates that a Cloudflare Worker script attempted to consume more memory (RAM) than is ...
Worker script compilation error
Error 1105 signifies that Cloudflare was unable to successfully compile your Worker script. This typ...
Mastering Cloudflare Errors
To effectively troubleshoot Cloudflare Errors, it is essential to look beyond the error message itself. Most of these issues follow a predictable pattern. Isolating the variable is key. Is it happening on all devices? Is it specific to one browser? Answering these questions will narrow down the root cause.
Our database is constantly updated with the latest solutions and workarounds. By understanding the technical nuance behind each code, you can prevent future occurrences and maintain a healthy, accessible digital environment.