IPSec between OS X clients and Windows Server (native, no 3rd party)

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http://serverfault.com – I would like to connect Mac OS X (Lion) with Windows Server 2008 (R2) using IPSec natively. Simplest possible settings: No certificates, no tools, no specials. Just a Windows Server with IPSec "Pre-Shared Key" Authentication. Looks like an easy job, but after weeks of research I still have no success. Attached there's a screenshot of the Windows settings. It works perfect with Windows clients, it doesn't matter which version. The whole rule is based on a 1to1-connection, that means the client is connecting (behind a NAT) to the Server (internet-facing). There are no server hardware/network-fi (HowTos)