Hi, In this section am going to discuss about How To Check & Open Ports In CENTOS / FEDORA / REDHAT. If you want to open or close a port for a Linux firewall you have to edit the rules in the iptables . By default, iptables firewall stores its configuration at location /etc/sysconfig/iptables file. You need to edit this file and add rules to open port.
Here are the steps to open the port XY using the default visual editor vi:
Open port XY
Open flle /etc/sysconfig/iptables:
# vi /etc/sysconfig/iptables
Append rule as follows:
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport XY -j ACCEPT
Save and close the file. Restart iptables:
# /etc/init.d/iptables restart
Verify that port is open
Run following command:
# netstat -tulpn | less
Make sure iptables is allowing port connections:
# iptables -L -n
Its a very simple step, soo try it and make it.
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