I have port forwarded my modem/router from my ISP and my router to open ports 1723 and 3389 for PPTP and RDP successfully. This is my current setup:

ISP modem/router (FiberHome AN5506-04-FA):

  • Port forwarded 1723 and 3389 to
  • Placed in DMZ
  • WAN IP is 112.x.x.x
  • Cannot find VPN passthrough option
  • disabled firewall and upnp


my router (DLink with DD-WRT):

  • Connected LAN1 of the ISP router to the WAN port.
  • Setup WAN port to static ip DNS1 is set to DNS2 is set to the ISP's DNS.
  • LAN ip is
  • configured static leases: for my PC to RDP, for my Windows Server 2008 R2 with RRAS configured for VPN
  • port forwarded 3389 to PC1
  • port forwarded 1723 to WS08
  • Placed WS08 to DMZ
  • PPTP passthrough is enabled
  • disabled firewall and upnp

then on my devices:

PC1 (

  • RDP service is enabled
  • Windows Firewall is turned off
  • verified via canyouseeme.org that port 3389 is open

then on my VPN server

WS08 (, two NICs)

  • NIC 1 has the static IP address of (External)
  • NIC 2 is disconnected (Internal)
  • IP address range for the VPN clients is static/no radius (
  • Firewall is turned off
  • verified via canyouseeme.org that port 1723 is open

When I am connected using laptop to another network (external IP is 121.x.x.x), I can remotely access PC1 through the WAN public IP (112.x.x.x). But when I dial in from a Windows 7 VPN dialer supplying the WAN public IP, error 807 appears. But also I can connect to the VPN server if my laptop is connected to the same network as the VPN server and supplying the dialer with the private IP of the server (

I am stuck and don't know what else needs to be checked.

Appreciate any responses.

1 Answer 1


Figured it out by registering to a Dynamic DNS service and binding the public IP of my WAN to my created hostname.

After which, I re-checked all port forwards.

PPTP and RDP are working after that.

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