JWNR2000V2 VPN Problem

Hello,

A customer of me has bought a new router: Netgera N300 model: JWNR2000v2.
They have a Windows 2011 SBS server configured with VPN. On the last router i only needed to open port 1723 for the VPN to work but with the new Netgear router i cant get the VPN connection to the Windows server to work.

Is it even possible to create a VPN trough the router to the server (PPTP)?
Or do i have to buy another router?

Thanks in advance.
- sheepson