Plesk VPN module - No 'dev tun' or 'dev tap' found (OSX)

[Ghillie-Up]

I'm testing the water with Plesk (CentOS 6) and can see it now supports VPN. However after configuring the control panel and downloading the key. I am prompted via Tunnelblick (on OSX MAV) that "No 'dev tun' or 'dev tap' found"?

As far as I can tell IPtables has been configured to allow VPN and that IP forward has been set:

# Controls IP packet forwarding
net.ipv4.ip_forward = 1

[root@plesk etc]# lsmod | grep tun
tun                    17095  2

Am I believing this module is something it isn't ?

So I need to physically install OpenVPN via CLI too?

Any help would be appreciated.

Thanks.