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Passthrough VPN on DD-WRT interface

I have a router with DD-WRT interface. I have installed remote and routing interface on Windows server 2003 with static route. I don't see any error on Windows server, however, when I try to create VPN connection on client it fails to connect with error 880.
I think this is something do with passthrough setup on DD-WRT as Windows does not have any error. I am skeptic about opening direct PPTP from DD-WRT as it won't be secure for an organization. Further, I do not want to wipe existing configuration on router as it is also offers DHCP services instead of Windows server.
1 Solution
QlemoBatchelor and DeveloperCommented:
I'm not getting exactly what you are talking about. Of course you need to open (and forward) PPTP (and GRE) to your RRAS server, otherwise clients won't be able to connect.
For a first test, use the internal IP of RRAS from a client, just to see whether RRAS works at all.
After that test connections from public interface (Internet). Don't use a LAN PC trying to PPTP to the public IP - the router most likely does not support that.
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