I know this something very very few people have ever attempted, but Windows 7 can't seem to handle more than two outgoing L2TP VPN connections. SSTP does not exhibit the same problem (can't say for the other protocols as I don't have 3 of any of those available to test). If you attempt to connect an L2TP VPN connection when two other L2TP connection are already active, you immediately get the following error:
I can switch around which two I'm connected to, but I can never connect more than two. If I use SSTP, all three work just fine.
This seems very odd to me. Why would it matter on the client side which type of connection I'm using. I can see a limit of one, but a limit of two seems very odd. If the limit was intentional, I would expect all types of VPNs to be limited and that there would be a much more descriptive error message, or just silent failure.
Is there any way around this limit? Some registry key that limits it?