ERR_NGROK_334 - ngrok documentation

Message

The endpoint URL is already online. Either

stop your existing endpoint first, or
start both endpoints with --pooling-enabled to load balance between them.

Additional Information

You can only use a tunnel URL for one tunnel session at a time. This error occurs when an ngrok tunnel with the requested URL is already online. This error also appears if you attempt to create multiple tunnels using the same hostname.

You can view tunnel status from your dashboard.
You can also view actively connected agents from your dashboard. Select one from the list to view any tunnels that agent is handling.

Possible Solutions

Stop the tunnel that is currently running in order to make your desired URL available.
Choose a different unique URL or hostname to start your tunnel.

Further help

If you’re having trouble resolving this error, please reach out to support@ngrok.com

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Further help