Archive for July, 2011

VPN Router connection issue resolved

July 2, 2011

I was trying to get the VPN server working on a Windows 2008 R2 server and was stumped as to why it would not work from outside the LAN. It was working inside the LAN but not from outside. I had opened the correct ports on the router but it still was not working. It was a Comcast modem/router I was working with and it turned out to be that the Generic Routing Encapsulation (GRE) protocol was not enabled on the router. Once I had enabled that everything started working. For VPN the protocol number is 47. On this router there was not way to specify the protocol number. It was just GRE is enabled or not.