Install Trusted Certificates
In order to get rid of warnings when performing HTTPS filtering, the Root Certificate that Squid uses to generate certificates for filtered HTTPS sites needs to be installed as trusted Root Certification Authority in every connecting browser.
The Root Certificate can be downloaded from login page of Web Safety or from HTTPS Filtering / Filtering Mode tab. Click on the certificate name to download it.
Unfortunately steps to install this certificate as different for different operating systems. We will show how this can be done in Microsoft Windows 10 (and other Windows versions) and Apple MacOS X.