If you see the message Security or firewall might be blocking the connection following completion of Windows Network Diagnostics to determine what’s causing internet or network connection issues on ...
I've just setup IPsec on my router (pfSense) and my IPsec clients have a different subnet (192.168.10.0/24) than my LAN subnet (192.168.0.0/24). By default, the Windows Firewall (in Windows 7 at least ...