If you keep on getting the error message “This site is not secure” or “This page is not secure” coming up in Opera, Internet Explorer, Microsoft Edge, Mozilla Firefox or Google Chrome on your Windows PC, we have a few solutions for you.
Due to security reasons, whenever the safety of the blocked website is compromised you may get the message “The site is not secure” or DLG_FLAGS_SEC_CERT_CN_INVALID.
It comes up on any version of Windows, but Windows 10 users are most frequently complaining about this bug currently.