I am setting up a Debian-based 3CX server and initially the firewall check passed all tests. Upon forming a bridge with the server configured as the slave end, the firewall check started failing when testing port 5060 - "Mapping does not match 5060. Mapping is 1024". Ports 9000+ would also intermittently fail the NAT cone tests afterwards. The firewall continues to fail the check,even after deleting the bridge. I've also tried rebooting the server, and rebooting the firewall. The only way I've found to get the firewall check to pass again is to reinstall the whole server and restore from a backup. Is this a bug?