# 404 Web Site not found.

You may be seeing this error due to one of the reasons listed below :

- Custom domain has not been configured inside Azure. See [how to map an existing domain](https://go.microsoft.com/fwlink/?linkid=2194614) to resolve this.
- Client cache is still pointing the domain to old IP address. Clear the cache by running the command _ipconfig/flushdns._

Checkout [App Service Domain FAQ](https://go.microsoft.com/fwlink/?linkid=2194451) for more questions.