HTTP to HTTPS Redirect - IIS 8.5 not working properly

Question

I've read a number of posts here on SO as well as on the 'net (IIS blogs, etc.). I'm trying to force all connections going from domain.com to www.domain.com and at the same time forcing the request from HTTP to HTTPS.

I'm using this set of rules and rewrites but the only thing happening is that it's redirecting fine but not redirecting to SSL.

<!-- Redirect to HTTPS -->
<rewrite>
    <rules>
        <rule name="Redirect to www" stopProcessing="true">
            <match url="(.*)" />
            <conditions trackAllCaptures="false">
                <add input="{HTTP_HOST}" matchType="Pattern" pattern="^mydomain.com$" ignoreCase="true" negate="false" />
            </conditions>
            <action type="Redirect" url="{MapProtocol:{HTTPS}}://www.mydomain.com/{R:1}" />
        </rule>
    </rules>
    <rewriteMaps>
        <rewriteMap name="MapProtocol" defaultValue="http">
          <add key="on" value="https" />
          <add key="off" value="http" />
        </rewriteMap>
    </rewriteMaps>
</rewrite>

What am I doing wrong?

Main blog reference: http://weblogs.asp.net/owscott/url-rewrite-protocol-http-https-in-the-action and this SO post - web.config redirect non-www to www

Answer 1

This is a long shot for some cases but I had deleted my port 80 bindings for the website as I only wanted SSL / port 443. So from what I can tell is Port 80 binding is also needed for the the rewrite to work correctly.