Customize cipher suites

With Advanced Certificate Manager or within Cloudflare for SaaS, you can restrict connections between Cloudflare and clients - such as your visitor’s browser - to specific cipher suites.

This process will not lead to any downtime in your SSL/TLS protection.

​​ Setup

Currently, you can only customize cipher suites when using the API:

• Zone Open API docs link
• Per-hostname Open API docs link (regular zones only)
• Custom hostname Open API docs link (Cloudflare for SaaS zones only)

When you customize cipher suites for a zone, the restriction affects all hostnames within the zone.

Cloudflare uses the hostname priority logic to determine which setting to apply.

​​ Cipher suite values

​​ TLS 1.2 or lower

To specify certain cipher suites, include an array of applicable cipher suites used for TLS 1.2 or lower in the value field. Cloudflare offers a list of recommended ciphers by security requirements, but you can also refer to the full list of supported ciphers.

​​ TLS 1.3

You cannot set specific TLS 1.3 ciphers.

Instead, you will need to enable TLS 1.3 for your entire domain and Cloudflare will use all applicable TLS 1.3 cipher suites.

In combination with this, you can still restrict specific ciphers for TLS 1.0-1.2.

​​ Reset to default values

For zones and custom hostnames, to reset to the default cipher suites, send an empty array in the value field.

For specific hostname settings, use the Delete TLS setting for hostname Open API docs link endpoint.