Has anyone ever got XP SP2 or greater

L2TP IPSec VPN connection to work when the RRAS server and the XP client are both behind NAT devices?

Before anyone starts suggesting fixes, I’ve tried the IPSec AssumeUDPEncapsulationContextOnSendRule registry hack and that didn’t work.

This is stictly a XP problem and not a RRAS server problem. The RRAS server accepts Windows Vista/7 L2TP IPsec remote clients with no problem. and if I use the RasMan ProhibitIpSec registry setting L2TP connects but without IPSec without issue but then there’s no IPSec encryption.