Too many connections! The tunnel session session has violated the rate-limit policy of threshold connections per minute by initiating count connections in the last seconds seconds. Please decrease your inbound connection volume or upgrade to a paid plan for additional capacity.
ngrok limits the number of inbound connections to your tunnels. Limits are imposed on connections, not requests. If your HTTP clients use persistent connections aka HTTP keep-alive (most modern ones do), you'll likely never hit this limit. ngrok will return a 429 response to HTTP connections that exceed the rate limit. Connections to TCP and TLS tunnels violating the rate limit will be closed without a response.
If you're having trouble resolving this error, please reach out to support@ngrok.com.