devscap
The procedure for opening ports in the Linux firewall "iptables" is relatively simple. First, open a command-line terminal. In most systems, you can usually find this in your 'Applications' menu under the 'System Tools' section. Once you have a terminal open, you have to obtain root access to change firewall settings. Do this by typing:
su -
You will be prompted for your root password. In the following examples, substitute the port # you want to open for the 4433 in the command. If you want to open an incoming TCP port, type the following:
iptables -I INPUT -p tcp --dport 4433--syn -j ACCEPT
If you want to open a UDP port (perhaps for DHT in Tixati), type the following:
iptables -I INPUT -p udp --dport 4433 -j ACCEPT
After you are done opening ports in your firewall, you can save your changes so they will be applied when you restart your computer by typing the following command:
service iptables save
And/or since I dont know what your system distro is... You can execute the following command, with the number of the port to be opened:
Debian:
To Open:
sudo ufw allow 4433
To Close:
sudo ufw deny 4433
CentOS:
To Open:
sudo firewall-cmd --zone=public --permanent --add-port=4433/tcp
sudo firewall-cmd --reload
To Close:
sudo firewall-cmd --zone=public --permanent --remove-port=4433/tcp
sudo firewall-cmd --reload