My experience is that the firewall checker will only complete without error if ports 5060, 5090 and 9000-9500 are open to everyone. I know the IP addresses (CIDRs) of the people who will be accessing using the phone system. So I would like to be able to add firewall rules to restrict access to these ports from valid IP addresses to reduce the scope for attack on these ports. Is there a way to use the firewall checker successfully with more restricted firewall access? If the firewall check has been successful once, does it matter if the firewall check will no longer succeed because of more restrictive firewall rules?