Issue with SSL in homepage and wp-admin

Hi all, i have installed ssl certificate on a site in my network and the homepage or admin section isn't protected.

In the frontend only the homepage is not showing the padlock all other pages are working normally with the padlock, i have analysed with ssl tools and it reports this:

"SSL verification issue (Possibly mis-matched URL or bad intermediate cert.). Details:
ERROR: cannot verify's certificate, issued by '/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA': Unable to locally verify the issuer's authority."

I have check if there is any image or static files using "http" protocol and i cant' find nothing that could block the padlock in the browser.

The site domain in my network is

Thank you