How to Verify the Certificate is installed properly

Run IIS from the Administrative Tools.
Navigate to Web site>Default Web site.
Right mouse-click and select Properties.
Select the Directory Security tab.
Select the View Certificate be sure that You have a private key that corresponds to this certificate. If it displays "Windows does not have enough information to verify this certificate", Double check the CSR. If this is test CA Root, you may need to install Test CA Root on the same computer.

6. Once you fix it, you should be OK to access it using HTTPS.