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.
I checked again the Firewall Configuration on my RV042, and could not found any mistake. After a quick search with Google and Bing 
I saw a lot of posts with the same problem and the Linksys RV042.
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.
Thanks for the tips.
Were you able to run the VPN connecting for quickVPN software?
I did use the PPTP VPN Server provided by Windows Server