Used the VPN Wizzard. After that I enabled IKE system service at the untrust zone. And decreased the maximum users from 50 to 2.
Checked the config with the throubleshooting guide, but without any luck. Pusle client on Windows 8.1 stays in 'Connecting...' state for indefinitely. This is after the certificte warning and login. Login credentials do work when browsing to the dynamic-vpn url.