One can't be positive without knowing what is underneath the grey there, but I can say the below two statements with the near certainty it will fix your issue.
If your using a routed connection (like a PPTP tunnel) whose network is contained within an existing route then you will need to use proxy ARP. Translation (for your environment), use proxy ARP on the PPTP server if it's PPTP Pool falls within the LAN Net.
"Default Rule" means you have insufficient IP Rules, "Default Access Rule" means you have insufficient routes.