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Redhat / CentOS / Fedora Linux Open Port

Red Hat Enterprise Linux 3 / 4 / 5 and above
=> Old Red hat Linux version
=> CentOS 4 and above
=> Fedora Linux

1) Open port 80

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 80 -j ACCEPT
Save and close the file. Restart iptables:
# /etc/init.d/iptables restart

2)Open port 110

Append rule as follows:
-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 110 -j ACCEPT

3)Open port 143

Append rule as follows:
-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 143 -j ACCEPT
Restart iptables service

Type the following command:
# service iptables restart

Verify that port is open Run following command:
netstat -tulpn | less
Make sure iptables is allowing port 80 / 110 / 143 connections:
iptables -L -n

Refer to iptables man page for more information about iptables usage and syntax:
man iptables

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