LuLu on a Mac
Free open-source outbound firewall (macOS app) · Security Tools
LuLu (Objective-See) is a free, open-source firewall that alerts on and blocks unknown *outbound* connections; the thing macOS's built-in Application Firewall doesn't do. Install the app cask; rules are managed in its menu-bar UI. The Security pane's firewall section offers one-click install.
Run LuLu with FrontierStack
Install or connect LuLu; then check its status, ports and certificate from FrontierStack. The same screen links to firewall checks, Malware Audit and backups where they apply.
Run it from your Mac.
FrontierStack installs, monitors and secures services on this Mac and on linked servers.
Download FrontierStackApple notarized · Safe & secure · macOS 13 Ventura+