Help with L2TP/IPsec Server with windows clients

Hi everyone

Someone could make a L2TP/IPsec using RouterOS?

I used this howto

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

But it does not work. I´ve tried using XP, Vista, 7 and RouterOS v. 3.30 and 4.6

Any help would be apreciate.

Regards.