No joy with Beta 2. My iPhone and company Winblows 8.1 all connect to the VPN fine through the same Airport Extreme so it has to be down to Yosemite. The server 2008 reports the following in the event viewer: -
A connection between the VPN server and the VPN client xx.xx.xx.xx has been established, but the VPN connection cannot be completed. The most common cause for this is that a firewall or router between the VPN server and the VPN client is not configured to allow Generic Routing Encapsulation (GRE) packets (protocol 47).
If I turn off the MacBook Pro firewall still no luck. Some how GRE is not passed/allowed/switched on but I'm at a loss I have to say.