CentOS - Open port in Firewall

Step 1: Edit file /etc/systemconfig/iptables

vi /etc/sysconfig/iptables

Append rule as follows:
If you want to open port 80:

-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT

If you want to open port 443:

-A INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT

If you want to open port 8888:

-A INPUT -m state --state NEW -m tcp -p tcp --dport 8888 -j ACCEPT

Step 2: Save this file by pressing ESC and type :wq! then Enter


Step 3: Restart iptables service

service iptables restart

Done!

References

• cyberciti.biz