Moving from HTTP to HTTPS for site

Hello,
I've been testing on HTTP and need to move to HTTPS.
I've got the cert installed and confiured in IIS; still using both port 80 and 443.
When I request https://shop.mysite.com I get redirected to http://shop.mysite.com/Default.aspx (note the protocol switches back to HTTP).

I tried setting the site name in Global settings to HTTPS://...
and have checked the box for SSL on the security section of administration.
Neither one of these configuration settings made any difference at all!


What am I missing?

1. Opeb web.config file
2. Find 'UseSSL' attribute and set its value to 'true'

I am experiencing errors redirecting from http to https for about-us.aspx and Products pages , other all pages working fine. I am using Umbraco 1.8

I have followed all steps to make the changes

any help would be much appreciated  

Thanks and regards

Prabir