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If you want to open or close a port for a Linux firewall you have to edit the rules in the iptables configuration. By default iptables firewall stores its configuration at /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:
Append rule as follows:
Save and close the file. Restart iptables:
Verify that port is open Run following command:
Make sure iptables is allowing port connections:
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