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Full (strict) - SSL/TLS encryption modes

When you set your encryption mode to Full (strict), Cloudflare does everything in Full mode but also enforces more stringent requirements for origin certificates.

​​ Use when

For the best security, choose Full (strict) mode whenever possible (unless you are an Enterprise customer).

Your origin needs to be able to support an SSL certificate that is:

​​ Required setup

​​ Prerequisites

Before enabling Full (strict) mode, make sure your origin:

  • Allows HTTPS connections on port 443.
  • Presents a certificate matching the requirements above.

Otherwise, your visitors may experience a 526 error.

​​ Process

To change your encryption mode in the dashboard:

  1. Log in to the Cloudflare dashboard and select your account and domain.
  2. Go to SSL/TLS.
  3. Choose an encryption mode.
To adjust your encryption mode with the API, send a PATCH request with ssl as the setting name in the URI path, and the value parameter set to your desired setting (off, flexible, full, strict).

​​ Limitations

Depending on your origin configuration, you may have to adjust settings to avoid Mixed Content errors or redirect loops.