Ubuntu Firewall
From FusionPBX
Ubuntu includes ufw (uncomplicated firewall) by default, but it is not enabled.
Configure the Uncomplicated FireWall via CLI
#Install UFW sudo su apt-get install ufw
#SSH ufw allow ssh
#FusionPBX ufw allow 80/tcp ufw allow 443/tcp
#FreeSWITCH - Sofia ufw allow proto tcp from any to any port 5060:5069 ufw allow proto udp from any to any port 5060:5069 ufw allow 5080 ufw allow 5081 ufw allow proto udp from any to any port 16383:32768
#Enable UFW ufw default deny ufw enable ufw logging on
Optional Ports
#OpenVPN ufw allow 1194/udp ufw allow 1194/tcp
#H323 ufw allow 1719/udp ufw allow 1720/tcp
#STUN ufw allow 3478/udp ufw allow 3479/udp
#MLP protocol server ufw allow 5002/tcp
#Neighborhood service ufw allow 5003/udp
Additional Commands
ufw status ufw delete 3
Happy Firewalling!
More Information
https://help.ubuntu.com/10.04/serverguide/C/firewall.html
http://pka.engr.ccny.cuny.edu/~jmao/node/28
https://help.ubuntu.com/community/UFW
man ufw