HTTPS protocol was designed to securely transmit information between internet web browsers and web servers. There are two reasons to setup MITM.
1) Marco works on several different layers and can to a large extent block inappropriate websites without decrypting this traffic. However, when Marco deems a site to be inappropriate it displays a friendly page to the user. If the site is HTTPS, this page will not be displayed correctly instead the below will be seen. In order to properly display the informational page, click on your operating system below to follow the directions on installing the Marco certificate.
2) If you have configured “Enable MITM on sites”, you will need to configure MITM so that you do not get any browser errors.
To configure MITM follow the guides below.