I'm on a laptop running Vista Ultimate and I'm trying to create a VPN connection to my office. The router at my office is a Linksys WRT54GS. I've got it forwarding requests on port 1723 to a Windows Server 2008 R2 (64 bit) server. I've opened port 1723 using an inbound rule on the 2008 Server firewall.
When I try to connect to the VPN, it fails and when I have Vista diagnose the problem, it gives me the following message:
Can anyone help me out?
Also, there seem to be firmware releases which are not able to support PPTP passthru as needed.
You could try to switch to L2TP/IPSec, which needs udp/1701 (and udp/500, udp/4500 for IPSec might also be needed to be forwarded). L2TP just needs a secret password, called a pre-shared key, which is common for the server and all clients, and is hence easy to set up.
And there is always the free DD-WRT firmware, which allows to use the router itself as VPN server, eliminating many issues with port forwarding and firewalling.