Error Code Portal
CloudflareCloudflare HTTP errorsError code

526

Error 526: invalid SSL certificate

Alternative forms: Error 526

What does this code mean?

Code 526 · An issue reported by Cloudflare HTTP errors.

Official explanation · Original text

This error indicates that Cloudflare is unable to verify the SSL certificate on your origin server, preventing a secure connection from being established. This error occurs when these two conditions are true:

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

Error 526: invalid SSL certificate ↗

Creator: Cloudflare, Inc. and contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Selected introductory official description; Markdown stripped; original Korean product context added. Direct official error page retains the complete cause and resolution instructions.

Source details · Original licenses and notices