Hello,
in our enviroment we have since iOS 11 this Error in Safari " This Connection is Not Private".
I read already this report:
https://www.thesslstore.com/blog/crypto-ssl-improvements-high-sierra-ios-11/
and this
https://support.apple.com/de-de/HT207828
we have alreade disable TLS 1.0 and TLS s1.2 and active only TLS 1.2 but it dosn´t work.
iOS 10.3.3 and earler works fine.
Regards,
Dima