Because of the different components and processes involved, troubleshooting site-to-site VPN connections can be a difficult task. This section describes the tools that are provided with Windows Server 2008 to troubleshoot site-to-site VPN connections and the most common problems with site-to-site VPN connections.
Microsoft provides the following tools to troubleshoot VPN connections from the VPN router:
TCP/IP troubleshooting tools
Authentication and accounting logging
NPS event logging
Network Monitor 3.1
For information about these tools, see Chapter 12.
For site-to-site VPN connections, you can also use the unreachability reason facility. When a demand-dial interface fails to make ...