ERR_TOO_MANY_REDIRECTS after adding Cloudflare

Visitors get stuck in a redirect loop, most commonly because Cloudflare's SSL/TLS mode is Flexible while the origin redirects HTTP to HTTPS. Set the encryption mode to Full (or Full strict) with a valid origin certificate, or remove the conflicting redirect.

Cause: SSL/TLS encryption mode conflicts with origin redirects, or redirect rules conflict.

How to fix it

Check SSL/TLS > Overview encryption mode.
If Flexible and the origin forces HTTPS, switch to Full or Full (strict).
Review Always Use HTTPS, HSTS and redirect rules for conflicts.
Clear cookies/cache and test in a private window.

Example

Illustrative example, not from a customer project.

  SSL/TLS encryption mode
- Flexible
+ Full (strict)

FAQ

Why did it start after moving DNS to Cloudflare?

Flexible mode talks to your origin over HTTP; if the origin redirects to HTTPS, it loops.

Firefox shows a different message.

Cloudflare's docs mention 'The page isn't redirecting properly' as the equivalent.

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