Here you will find how to setup L2TP/IPsec VPN protocol on Mac OS. Setting up HeadVPN access under Mac OS is simple. The following instructions go step-by-step through the creation process of a L2TP/IPsec VPN connection.
Go to main menu and select System Preferences… (1)

Choose Network (2)

Press “+” to add new connection (3).

Interface: VPN (4).
VPN Type: L2TP over IPSec (5).
Give a name for this connection, for example: HeadVPN L2TP (6).
Press Create (7).

In Server Address box introduce the server name you want to connect (8), for example: us4.headvpn.com
Type your VPN username (9) and press Authentication Settings (10).

Type your VPN Password (11) and Shared Secret key: headvpn (12). Press OK (13).

Press Advanced… (13)

Check all settings as it shown in the image bellow (14).

Now you can connect to HeadVPN network. Choose from the list of connection your new HeadVPN L2TP (15).

Check you connection status in Network Settings.
You are DONE !

Enjoy HeadVPN service!