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Troubleshooting client certificates

If your query returns an error even after configuring and embedding a client SSL certificate, check the following settings.


Check SSL/TLS handshake

On your terminal, use the following command to check whether an SSL/TLS connection can be established successfully between the client and the API endpoint.

curl -v --cert /path/to/certificate.pem --key /path/to/key.pem https://your-api-endpoint.com

If the SSL/TLS handshake cannot be completed, check whether the certificate and the private key are correct.


Check mTLS hosts

Check whether mTLS has been enabled for the correct host. The host should match the API endpoint that you want to protect.


Review mTLS rules

To review mTLS rules:

  1. Click Firewall > Firewall Rules.

  2. On a specific rule, click Edit.

  3. On that rule, check whether:

    • The Expression Preview is correct.

    • The hostname matches your API endpoint. For example, for the API endpoint api.trackers.ninja/time, the rule should look like:

      (http.host in {"api.trackers.ninja"} and not cf.tls_client_auth.cert_verified)
  4. To edit the rule, either use the user interface or click Edit expression.