NCSR DEMOKRITOS
Institute of Nuclear and Particle Physics
Patriarxou Grigoriou & Neapoleos
P.O: 60037
15310 Aghia Paraskevi
GREECE
tel: +30 2106503512
fax: +30 2106503529
email: info AT inp.demokritos.gr

Download OVPN Community client :

http://openvpn.net/index.php/open-source/downloads.html#latest-stable

Download CA cert:

https://pki.demokritos.gr/collect/2257/dTzranChS3ef594y/chain-pem

rename it as : root.crt and copy the CA cert to your ovpn folder

client.conf (linux) , client.ovpn(windows) sample:

client
auth-user-pass
script-security 2
auth-nocache
redirect-gateway
dev tap
proto tcp
remote 143.233.252.2 1194
remote 143.233.250.1 1194
resolv-retry infinite
nobind
persist-key
persist-tun
ca root.crt   ;(or root.cer)
verb 3

Run the service as super user (permit tcp port 1194 at your firewall)

openvpn  –config  client.conf

How to setup ovpn client under Windows

Configuring
You need to create a new configuration file client.ovpn located in C:\Program Files\OpenVPN\config\, for example C:\Program Files\OpenVPN\config\client.ovpn and put these lines into this configuration file:

******************************************
client
auth-user-pass
script-security 2
auth-nocache
redirect-gateway
dev tap
proto tcp
remote 143.233.252.2 1194
remote 143.233.250.1 1194
resolv-retry infinite
nobind
persist-key
persist-tun
ca root.cer
verb 3
******************************************

Place these files root.cer or root.crt into directory C:\ProgramFiles\OpenVPN\config

Run OpenVPN GUI from “Start” -> “All programms” -> “OpenVPN” -> “OpenVPN GUI”. After you run this software, you should see an icon OpenVPN in system tray. Click on mouse’s right button and choose “Connect”. After you click on it, it takes about 1 minute to establish connection.

OVPN How TO

http://openvpn.net/howto.html