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[ZT] Tunnel post-quantum flag #22764

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May 29, 2025
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[ZT] Tunnel post-quantum flag #22764

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11 changes: 11 additions & 0 deletions ...ns/connect-networks/configure-tunnels/cloudflared-parameters/run-parameters.mdx
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Expand Up @@ -123,6 +123,17 @@ Specifies the [account certificate](/cloudflare-one/connections/connect-networks

Writes the application's process identifier (PID) to this file after the first successful connection. Mainly useful for scripting and service integration.

## `post-quantum`

| Syntax | Environment Variable |
| -------------------------------------------------------- | -------------------- |
| `cloudflared tunnel run --post-quantum <UUID or NAME>` | `TUNNEL_POST_QUANTUM`|


By default, Cloudflare Tunnel connections over [`quic`](#protocol) are encrypted using [post-quantum cryptography (PQC)](/ssl/post-quantum-cryptography/) but will fall back to non-PQ if there are issues connecting. If the `--post-quantum` flag is provided, `quic` connections are only allowed to use PQ key agreements, with no fallback to non-PQ.

Post-quantum key agreements are not supported when using `http2` protocol.

## `protocol`

| Syntax | Default | Environment Variable |
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