> ## 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 423

## ERR\_NGROK\_423

The reserved domain name is limited to `MAX` characters; you are using `VAL` characters.
The name you've requested is: `DOMAIN`

## 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_423)