Model :

Hardware Version : Not Clear

Firmware Version :

ISP :

TL-470T+ V4

I have tried to setup a VPN using a Windows 8.1 incoming connection on our LAN using PPTP, I have opened the port 1723 to the LAN-IP and setup a virtual server pointing to the LAN-IP, I can connect using the VPN pointing directly to the LAN-IP but using the EXTERNAL-IP on WAN2 I get the following error, I have added the protocol GRE-47 to the protocol list but there is not an option to forward the protocol to a LAN-IP.

“The VPN connection between your computer and the VPN server could not be completed, The most common cause for this failure is that at least one internet device (for example, a firewall or a router) between your computer and the VPN server is not configured to allow Generic Routing Encapsulation (GRE) protocol packets. If the problem persists, contact your network administrator or Internet Service Provider.”

Has anybody had experience of this problem? And if so any suggestions how to but it right?

Thanks in advance.

Lee