Turn on the adaptive firewall in macOS Server

Learn how to use the adaptive firewall, and keep unauthorized users out of your network server.

macOS Server uses the adaptive firewall to protect against unauthorized users. If a user or IP address tries to access your network 10 times, the adaptive firewall creates a firewall rule.

If you have macOS Server installed, you can turn on the adaptive firewall. Log in as an admin, then use these terminal commands.

sudo /Applications/Server.app/Contents/ServerRoot/usr/libexec/afctl -c

sudo /Applications/Server.app/Contents/ServerRoot/usr/libexec/afctl -f