* disable GUI

vi /etc/inittab

Change "5" to "3" in the following line:
id:5:initdefault:

become
id:3:initdefault:

and reboot, boot in text mode ;) 

* Config firewall

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

Open port 110

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

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