Mac OS 10.9.0 and Server 3.0.0 and VPN server fails

The combo of Mac OS 10.9.0, Server 3.0.0 and the service VPN server is no winner at the current state. At least with 10.9.0 clients there's big problems (server refusing connections). It's possible to do a workaround though by (back up the binary first) exchanging the 10.9.0 /usr/sbin/racoon binary for one from 10.8 and Server 2. What worked for my was a binary from 10.8.5 (incl Supplementary Update) and Server 2.2.1.