Im developing an online game. After upgrading from Fedora to Centos 4.2 I noticed I no longer can connect to the server when the client is running outside the Centos PC. Making an udp scan from my internal network with nmap revealed that the port used by game server application appears as "filtered". In my firewall script I have a rule to allow all trafic in the internal interface, so, I dont know why does the port appears as filtered. How can i solve this?