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Linux Open Port 80 (HTTP Web Server Port)

am new CentOS/RHEL 5.x/6.x user. How do I open port 80 (Apache Web Server) under Red Hat / CentOS / Fedora Linux?

Tutorial details
DifficultyEasy (rss)
Root privilegesYes
RequirementsNone
Estimated completion time2m
The default configuration file for iptables based firewall on RHEL / CentOS / Fedora Linux is /etc/sysconfig/iptables for IPv4 based firewall. For IPv6 based firewall you need to edit /etc/sysconfig/ip6tablesfile.
Open this file using a text editor such as vi/vim or emacs:

Linux Open Port 80 (http)

# vi /etc/sysconfig/iptables
Append rule as follows rules on RHEL/CentOS version 5.x or older:
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
## Open 443 port i.e. HTTPS
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT
IF you are using RHEL/Centoa version 6.x or above, try:
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
## Open 443 port i.e. HTTPS
-A INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT
Save and close the file. Restart iptables service, enter:
# /etc/init.d/iptables restart