LuLu is a free, open-source firewall for macOS that lets you control which apps are allowed to send data from your computer. macOS includes a built-in firewall, but it mainly handles incoming connections. LuLu also monitors outgoing traffic. Installing and setting Up LuLu After downloading and installing the app, I allowed the LuLu Network Extension in macOS Settings. I then followed the configuration process. When I launched the app for the first time, the Settings … More → The post Product showcase: LuLu reveals unauthorized outbound connections from Mac apps appeared first on Help Net Security .