Mac OS X – Linux FreeS/WAN with X.509

Hi there, I'm working on a Mac OS X which should connect to a linux freeS/WAN-box (which is tested and works fine with other linux clients). I have x509-certificates and a corresponding private key for the Mac. I have configured racoon (maybe there are some bugs in my config) and I set up setkey. But now, every time I try to connect to the private network behind the vpn-gateway I get a timeout message in /var/log/racoon.log. Is there any howto on the web which describes the scenario or can anyone give any hints. Does anybody have a running configuration? My problem is I'm running out of time, the Mac is only lent from a customer and I only have access for a few days. Thank you in advance for any hints Marc