Click the network icon and select Open Network Preferences...
Click the (+) button on the network configuration screen.
Select VPN as Interface and L2TP over IPsec as VPN Type. Then click Create button.
A new L2TP VPN configuration will be created
Specify Server Address and Account Name. Then click Authentication Settings.
Input your Password and use pre-shared key: s3CuREpaSs412 Then select OK.
Returning to STEP 4.
Select Show VPN status in menu bar and Click on Advanced Settings...
Select Send all traffic over VPN connection.
Click the Connect button to start VPN connection.
Connection is established.