L2TP/IPsec VPN problem

I have tried following this tutorial, but when i try to connect, I get the 789 error on windows when i try to connect. I am using windows 8. and have made all steps :frowning:

http://wiki.mikrotik.com/wiki/MikroTik_RouterOS_and_Windows_XP_IPSec/L2TP

Can some one plz help me.

Watch the presentation in my sig.