Resolve double escape sequence error on IIS 7

Some images on your site fails to load with the error:

HTTP 404.11 - Not Found. The request filtering module is configured to deny a request that contains a double escape sequence

Here is the fix:

Edit applicationHost.config (notepad %windir%\System32\inetsrv\config\applicationHost.config)

Find:

<requestFiltering>

and change to:

<requestFiltering allowDoubleEscaping="True">

And the images will be loaded again!