Setting up FTP server on Ubuntu

https://help.ubuntu.com/10.04/serverguide/C/ftp-server.html

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How to install OpenVPN on Ubuntu Linux

Make sure you run all mentioned command as root not sudo
$sudo su

http://www.howtoforge.com/internet-and-lan-over-vpn-using-openvpn-linux-server-windows-linux-clients-works-for-gaming-and-through-firewalls

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How to scan a port using nmap

nmap -PN ec2-75-101-194-164.compute-1.amazonaws.com -p 80

Starting Nmap 5.21 ( http://nmap.org ) at 2012-02-17 14:56 IST
Nmap scan report for ec2-75-101-194-164.compute-1.amazonaws.com (75.101.194.164)
Host is up.
PORT   STATE    SERVICE
80/tcp filtered http

Nmap done: 1 IP address (1 host up) scanned in 2.43 seconds

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How to setup Amazon EC2 on ubuntu

https://help.ubuntu.com/community/EC2StartersGuide

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