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Minimum TLS Version

Minimum TLS Version only allows HTTPS connections from visitors that support the selected TLS protocol version or newer.

For example, if TLS 1.1 is selected, visitors attempting to connect using TLS 1.0 will be rejected. Visitors attempting to connect using TLS 1.1, 1.2, or 1.3 (if enabled) will be allowed to connect.

Availability

Free Pro Business Enterprise

Availability

Yes

Yes

Yes

Yes

It is not possible to configure minimum TLS version for Cloudflare Pages hostnames.

How to disable TLS 1.0

You can disable TLS 1.0 by choosing a higher minimum TLS version.

All users can apply this configuration to all hostnames in their zones following the steps under zone-level.

If you have an Advanced Certificate Manager subscription, you also have the option to disable TLS 1.0 (or other versions) with a per-hostname setup.

Setup

Zone-level

To manage the TLS version applied to your whole zone when proxied through Cloudflare:

  1. Log in to the Cloudflare dashboard and select your account.
  2. Select your website.
  3. Go to SSL/TLS > Edge Certificates.
  4. For Minimum TLS Version, select an option.

Per-hostname

Advanced Certificate Manager users also have the option to specify minimum TLS versions per specific hostnames in their Cloudflare zone.

This is currently only available via the API:

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

In the following example, the minimum TLS version for a specific hostname will be set to 1.2. Replace the zone ID, hostname, and API token placeholders with your information, and adjust the value field with your chosen TLS version.

Terminal window
curl --request PUT \
"https://api.cloudflare.com/client/v4/zones/{zone_id}/hostnames/settings/min_tls_version/{hostname}" \
--header "Authorization: Bearer <API_TOKEN>" \
--header "Content-Type: application/json" \
--data '{
"value": "1.2"
}'

Test supported TLS versions

To test supported TLS versions, attempt a request to your website or application while specifying a TLS version.

For example, use a curl command to test TLS 1.1 (replace www.example.com with your Cloudflare domain and hostname):

Terminal window
curl https://www.example.com -svo /dev/null --tls-max 1.1

If the TLS version you are testing is blocked by Cloudflare, the TLS handshake is not completed and returns an error:

* error:1400442E:SSL routines:CONNECT_CR_SRVR_HELLO:tlsv1 alert