First you should upgrade your endian to the latest version 3.2.5.
To do this, use the efw-upgrade command in the shell.
The https certificate must be installed on the client at "trusted root certification authority"
help.endian.com/hc/it/articles/115006253507-How-to-Set-Up-The-HTTPS-Proxy
i've tried to use https proxy
i can understand that endian can't read content and filter it, but why also blacklist / whitelist don't work ?
so i've tried to enable https proxy, downloaded certificate and import in browsers, but also this doenst work, browsers still show "certificate error"