Hello, I've set up a VPN on my Server 2008 machine that's behind a NAT router with 1 NIC. I can connect to the VPN (although I'm not entirely convinced I set everything up perfectly), however I get hundreds of these errors every time the RRAS service starts (or the machine reboots): ----------- Log Name: System Source: RemoteAccess Date: 6/8/2011 11:39:30 AM Event ID: 20171 Task Category: None Level: Warning Keywords: Classic User: N/A Computer: SERVER Description: Failed to apply IP Security on port VPN2-96 because of error: A certificate could not be found. Connections that use the L2TP protocol over IPSec require the installation of a machine certificate, also known as a computer certificate.. No calls will be accepted to this port. ------------ Any help would be great! I'm pretty new at this - so take it a bit easy on me :-) Thanks, - Brian