Server showing non-secure SSL connection

[solidpixel]

I think you have to manually create a self-signed SSL certificate for localhost, because at the moment you only have one for the .local URL.

Then once you have created the certificate, edit your gulpfile.js:

    browserSync( {
    proxy: "https://mysite.local",
    https: {
        key: "/path/to/localhost.key",
        cert: "/path/to/localhost.crt"
        }
    } );