Firewall configuration

The following rules are required to get the server instance running on Linux server :

# Games - Project Zomboid
-A INPUT -p tcp -m tcp --dport 8766:8767 -m comment --comment "Pzserver-Steam-8766:8767-TCP" -j ACCEPT
-A INPUT -p udp -m udp --dport 8766:8767 -m comment --comment "Pzserver-Steam-8766:8767-UDP" -j ACCEPT
-A INPUT -p tcp -m tcp --dport 16261:16271 -m comment --comment "Pzserver-UserRange-16261:16271-TCP" -j ACCEPT
-A INPUT -p udp -m udp --dport 16261:16271 -m comment --comment "Pzserver-UserRange-16261:16271-UDP" -j ACCEPT
-A INPUT -p tcp -m tcp --dport 27016 -m comment --comment "Pzserver-RCON-27016-TCP" -j ACCEPT

Naming is purely personal choice. You can use any content for the comment argument of each line.

Steam related lines have been used as previously some connection issue have been encountered. It's normally safe not to use them.

RCON is also not necesarry to get the game instance running and joignable. Can be useful for some situation.