I've used Server Manager to install and configure RRAS on a Windows Server 2008 R2 machine, and it appears to be running. I'm intending to use it as an L2TP/IPSec PSK host. However, VPN clients are unable to connect. I've ensured that Routing and Remote Access is checked on the Exceptions tab of Windows Firewall, but when I use PortQryV2 from another computer on the LAN on the same side of the perimeter hardware firewall as the server to send an L2TP query to UDP port 1701, I get a FILTERED response. In short, it looks like it's running, but it acts like it's not.
Have I missed something?