Hi Maxx

It would probably be a good idea if the Administrator generated a new self-signed SSL certificate for the domain and website. The process is relatively easy and instructions how to do so are freely available on the internet through Google Search. You have a choice, you can download a script and software that will actually walk you through the process or go to https://letsencrypt.org/getting-started/ for further information. Please accept my apologies if you are aware of these options.

Thank you.