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Looking at the ports
<port protocol="udp" port="20128"/> <port protocol="udp" port="20129"/> <port protocol="udp" port="20130"/> <port protocol="udp" port="20131"/>
Using nmap from remote locations
# firewall-cmd --zone=public --list-all public (default, active) interfaces: enp1s0f1 sources: services: dhcpv6-client http https ports: 20128/udp 20130/udp 20129/udp 20131/udp masquerade: no forward-ports: icmp-blocks: rich rules: ***SNIP***
testing to a port that is not in the firewall
$ nmap -p 50128 -sU -P0 x.x.x.x Host is up (0.00031s latency). PORT STATE SERVICE 50128/udp closed unknown $ nmap -p 50129 -sU -P0 x.x.x.x Host is up (0.00034s latency). PORT STATE SERVICE 50129/udp closed unknown
# nmap -p 50120 -sU -P0 x.x.x.x PORT STATE SERVICE 50120/udp filtered unknown
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