I have posted this message on Computers & Peripherals but there is no help there, so maybe here:
From some time (over a month) while opening LuLa site I can see warning:
Safari can’t verify the identity of the website „mer54715.datafeedfile.com”.
The certificate for this website is invalid. You might be connected to a website that is pretending to be
„mer54715.datafeedfile.com”, which could put your confidential information at risk. Would you like to connect ...
and such certificate tree:
GlobalSign Root CA
AlphaSSL CA - SHA256 - G2
*.datafeedfile.com
and in details:
*.datafeedfile.com
Issued by: AlphaSSL CA - SHA256 - G2
Expires: Tuesday, 30 October 2018 at 15:14:45 Central European Standard Time
and then annotation in red:
This certificate has invalid issuer
I am using Safari 10.0 on macOS Sierra.
I had conversation with help line person, but no respons regarding how to solve it.