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Connection Conundrum

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I have access to a lot of VPN's and have rarely had problems with any of them but at the moment I am having a problem (only on Windows 7) with one particular server and before I consign the matter to 'one of life's little mysteries' I thought I would see if anyone had any ideas.

The protocol is PPTP, the server is one of three from the same provider, the other two both work as do all those from other providers, which to my mind would tend to rule out port or firewall issues.
When I try to run this connection from Windows 7 I am getting an 807 error. When I tried to connect from XP Mode (on the same computer) the connection went through, which I would think rules out a server issue.

I do not get 'support' from this provider as I have one of the free (lifetime) licenses they offer from time to time but I did notify them of the problem and they said they could find no reason for it at their end.

I have tried shutting down both the Windows firewall and TinyWall as well as my AV, it never made the slightest difference, which leaves me with the question what (on Windows 7) could be preventing access to that one server?

Have you tried re-typing the site-address and credentials? I often see these issues resolved because of a typo in either one of those.

I tried that a couple of times before renewing the entire connection.
I know the credentials are right because they are working in XP Mode.

If you still have the problem you may check if, for some some reasons, the "Routing and Remote Access" service isn't running.

The network connection between your computer and the VPN server was interrupted. This can be caused by a problem in the VPN transmission and is commonly the result of internet latency or simply that your VPN server has reached capacity.
List of Error Codes that you may receive when you try to make a dial-up connection or a VPN connection in Windows 7
--- End quote ---

It sounds like something on Win7 is interfering with TCP traffic on port 1723, (or the GRE 47 packets), to that specific IP address - that would usually point to the firewall being the culprit.

From a CLI in both Windows 7 and XP:

tracert <vpn that's failing>

And paste the results, munge your IP if it shows up, (first couple of lines), and you're paranoid.

What AV are you using, some won't stop interfering even when disabled.

Even though it works OK from XP Mode on the same computer, if your router has a DMZ put the computers IP into it and try to connect to the VPN again from Windows 7, or if you have a separate modem, plug the computer directly into it and try.  Bypasses any strange firewall rules in the router.

In Computer Management->Event Viewer->Windows Logs->Applications there'll be the results of rasdial commands, a successful connection looks like:

What do you get if it's not the same, (and the actual event data not a picture, thanks) ?


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