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

# Error 203

## ERR\_NGROK\_203

The API authentication you specified is properly formed, but it is invalid. Your authentication: `TOKEN`. API keys and instructions are available on your dashboard: [https://dashboard.ngrok.com/api-keys](https://dashboard.ngrok.com/api-keys)

## Further help

If you're having trouble resolving this error, please reach out to [support@ngrok.com](mailto:support@ngrok.com?subject=Help%20with%20ERR_NGROK_203)