Configure 404 Errors in Azure with Umbraco

In Azure you will need to add a line to your web.config to allow the Umbraco 404 error page to work, otherwise your users will be greeted with the following message:

The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.

The change you need to make in your web.config is as follows:

<configuration>
  ...
  <system.webServer>
    <httpErrors existingResponse="PassThrough" />
  ...
  </system.webServer>
  ...
</configuration>