So Defender sent me a report (listed below) for one of our sites. The DNS it mentions (artisanpainter.com) is not ours, and I have no idea why it's there. We have zero connection to that website either listed anywhere. Can you please help me understand what's happening here and how to resolve and avoid it in future?
Our systems have detected that your site - https://magnetz.co.za/ - went down on May 30, 2018 7:17pm and is returning "Error: Hostname/IP doesn't match certificate's altnames: "Host: magnetz.co.za. is not in the cert's altnames: DNS:artisanpainter.com, DNS:artisanpainter.co.uk, DNS:mail.artisanpainter.co.uk, DNS:mail.artisanpainter.com, DNS:www.artisanpainter.co.uk, DNS:www.artisanpainter.com"."