---
title: Mutual TLS
summary: null
url: https://www.fastly.com/documentation/reference/api/tls/mutual-tls
---

The Mutual TLS API allows for client-to-server authentication using client-side X.509 authentication.

- [Managing and Uploading Mutual Authentications](https://www.fastly.com/documentation/reference/api/tls/mutual-tls/authentication/) - The Mutual TLS API allows for client-to-server authentication using client-side X.509 authentication. The main Mutual Authentication object represents the certificate bundle and other configurations which support Mutual TLS for your domains.
- [Setting and Unsetting Mutual TLS on TLS Activations](https://www.fastly.com/documentation/reference/api/tls/mutual-tls/activations/) - Mutual TLS can be added to existing TLS activations to allow for client-to-server authentication. In order to use mutual TLS, you must already have active server-side TLS using either <a href="https://www.fastly.com/documentation/reference/api/tls/custom-certs/activations/">custom certificates</a> or an enabled Fastly-managed <a href="https://www.fastly.com/documentation/reference/api/tls/subs/">subscription</a>.