> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fly.io/llms.txt
> Use this file to discover all available pages before exploring further.

# TLS Support

The Fly proxy only supports TLSv1.2 and TLSv1.3 with strong ciphers. Learn more about our [built-in TLS termination](/security/tls-termination).

## Supported Cipher Suites

These suites give us broad, secure coverage. We do not support very old browsers.

**TLS 1.3:**

```
TLS_AES_128_GCM_SHA256
TLS_AES_256_GCM_SHA384
TLS_CHACHA20_POLY1305_SHA256
```

**TLS 1.2:**

```
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
```

You can always get an updated list of supported ciphers from the [SSL Labs test results](https://www.ssllabs.com/ssltest/analyze.html?d=fly.io\&s=2a09%3a8280%3a1%3a0%3a0%3a0%3aa%3a791\&hideResults=on\&latest).