Error when accessing the web console Solved Locked

Hi all I see the following error when accessing the web console lately... mobile.abc.co.uk normally uses encryption to protect your information. When Google Chrome tried to connect to 350mobile.bvt.org.uk this time, the website sent back unusual and incorrect credentials. This may happen when an attacker is trying to pretend to be mobile.abc.org.uk, or a Wi-Fi sign-in screen has interrupted the connection. Your information is still secure because Google Chrome stopped the connection before any data was exchanged. You cannot visit mobile.abc.co.uk right now because the website uses HSTS. Network errors and attacks are usually temporary, so this page will probably work later. We do have a wildcard certificate for our domain but I'm a little nervous about applying it and what impact that would have on our mobile devices. Is there a correct procedure for this?