IIS - Create a from HTTP to HTTPS redirect

 1. Install the url rewrite module extension below.

https://www.iis.net/downloads/microsoft/url-rewrite

2. Then add this to the web.config inside <system.webServer>

  <rewrite>

            <rules>

                <rule name="HTTPS Redirect" stopProcessing="true">

                    <match url="(.*)" />

                    <conditions>

                        <add input="{HTTPS}" pattern="^OFF$" />

                    </conditions>

                    <action type="Redirect" url="https://{HTTP_HOST}/{R:1}" 

                    appendQueryString="false" redirectType="Permanent" />

                </rule>

            </rules>

        </rewrite>

Make sure you have https bindings set and that the firewall accepts incoming on 80 and 443.