> ## 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.

# ERR_NGROK_7156

## Message

Failed to attach hostport. The domain `HOSTPORT` is allocated for region `NEW_REGION` but the previous hostport is allocated in `OLD_REGION`.

## 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_7156).