XAMPP: your connection is not private NET::ERR_CERT_AUTHORITY_INVALID

Just an update. In Chrome and Vivaldi insert chrome://flags/#allow-insecure-localhost into the address bar and then enable "Allow invalid certificates for resources loaded from localhost." Even changing the domain from example.dev to example.test didn't work until I changed the above setting in the browser.

I could fix a similiar issue by using a different host name. I used "website.dev" an got these error in Chrome 63 on Windows7. After changing the C:\Windows\System32\drivers\etc\hosts to "website.test" and the "httpd-vhosts.conf" accordingly, it works.

I had a same issue over my practicing laravel Vhost. I changed "div" to "test" and typed "website.test" at the address bar, then it failed with the error, "ERR_CERT_AUTHORITY_INVALID". But if I typed "http://website.test" instead of the one I previously did, it worked. Since then it keeps working without "http://". So I think you need to remind windows TCP/IP hosts that your new host name needs a new mapping set.