Windows 8 and Server 2012 VPN Compatibility and Interoperability
Microsoft® Windows® Server 2012-based virtual private networking supports industry standards technology to provide customers with an open interoperable virtual private network (VPN) solution. The following downloadable document contains information about application compatibility of third party VPN client software with Windows and interoperability of Windows 8 VPN (RAS) client with third party VPN Servers and 3rd party VPN clients with Windows Server 2012 VPN (RAS).
Windows 8 and Server 2012 VPN Compatibility and Interoperability