Add the source code following in system.webServer section (web.config):
<rewrite>
<rules>
<rule name="HTTPS" stopProcessing="true">
<match url="(.*)" />
<conditions>
<add input="{HTTPS}" pattern="^OFF$" />
</conditions>
<action type="Redirect" url="https://WWW.YOUR-DOMAIN.COM/{R:1}" redirectType="Permanent" />
</rule>
</rules>
</rewrite>