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The firewall configuration in mac is a bit more complicated and requires an assessment of the system to ensure enabling the firewall does not impact functionality. It also requires setting up a launch daemon to ensure the firewall stays on after reboots or connections using VPN. This installer: https://utexas.box.com/v/cns-pf-firewall takes care of the work, but we recommend submitting a ticket to The CNS help desk if you need need assistance.