Error: The security Certificate is expired & Untrusted for geotrust certificate on Mobile devices.

Error: The security Certificate is expired & Untrusted for geotrust certificate on Mobile devices.

Solution:

1. Go to "https://cryptoreport.geotrust.com/checker/views/certCheck.jsp"

2. Enter your https website address.
3. it'll check if your certificate is valid or not.
4. In my case , it told my that i was missing a intermiddiate Certificate.
5. I've downloaded the intermediate Certificate and placed that certificate in my certificate file.
6. The Checked the Website again. It works