I'm setting up the VPN on SBS 2008. I've followed the directions here: http://www.c7solutions.com/blog/2009/03/configuring-sstp-vpn-on-small-business_31.aspx
to apply my IIS certificate (from godaddy) to the SSTP bindings.
The only thing that doesn't work is the Configure a VPN (within SBS Console). The error logged is:
The Routing and Remote Access service terminated with service-specific error 16389 (0x4005).