Site configured improperly at subdomain of lyst.co.uk

Steps to reproduce the issue: Go to : "https://w.lyst.co.uk/" It will give you message ``` The owner of w.lyst.co.uk has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website. ``` Image: {F163225} A attacker will send this link to user, where he will be shown this message, will break her/his trust from lyst. Tested in Firefox latest version. Thanks