Today I was setting up my little lab, I decided to create a Windows PPTP VPN for my lab network which should give me more comfort. First I installed the Network Policy and Access Services Role and did the configuration. I also enabled PPTP Passthrough, added a port forwarding and a firewall rule to my Cisco Linksys RV042. I know the RV042 is not really a big deal, but you have a lot of jobs and if you don’t really need a lot of network options, like me in my lab, this is a pretty cool device.
I now tested the VPN Connection with my Windows 7 Client. Error 800 and 807 which basically means no connection through the firewalls with the VPN Server.
After some search I came to a solution, I deactivated the SPI Firewall on the Device, and this caused the problem. After activating the SPI Firewall again, the error was gone and the VPN worked.