Been trying to configure an ASA 5505 to pass PPTP traffic from remote clients out in the cloud, to a PPTP server behind the device in my internal network.

Every time I try connection it fails, with the logs showing that my IP was identified and dropped as an "IP Spoof".

I've disabled my ACL's and tried connecting, with the same effect. I've also tried programming static routes, to the same effect.

I have enabled RPF on the outside interface with no effect. I've tried reading the command line configuration guide on how to program the device, but all the options are to program the device as the VPN server itself.

Any ideas?