Norton Firewall Keeps Blocking Cloak VPN

Norton Firewall keeps blocking Cloak VPN access to the internet.  I tried to set the option to allow this app to have access, but that does not work.  When I start the app I get a message that asks if I want to allow this app to have access to the internet I also select the option to always allow access.  The Cloak VPN does connect when I give permission that way, but the next time I start it I get the same message from Norton Firewall.