Install Vallum

Download the ZIP file, uncompress it, open the DMG disk image and launch Vallum installer. Once finished your Mac will restart. Vallum firewall is set to automatically start at boot, use the Vallum icon in OS X menu bar, near the clock, to control the firewall.
Before running Vallum you should disable the built in OS X application-layer firewall from OS X System Preferences -> Security -> Firewall. You should also stop and uninstall third-party application firewalls as well.
Vallum requires OS X 10.9.4, 10.10, 10.11 or macOS 10.12 public beta.
To install Vallum you need to provide the administrator password. This is mandatory in order to install a kernel extension.