Edit web.config file in your website directory and carefully add this lines (remember to change domain name):
File: web.config
----------------
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<rewrite>
<rules>
<rule name="Force HTTPS" stopProcessing="true">
<match url="^(.*)
quot; /> <conditions logicalGrouping="MatchAll" trackAllCaptures="false"> <add input="{HTTPS}" pattern="^OFF
quot; /> </conditions> <action type="Redirect" url="https://website.com/{R:1}" /> </rule> </rules> </rewrite> </system.webServer> </configuration>