Found this today:

TCPIP PROPERTIES ON VPN CONNECTION NOT WORKING ON WINDOWS 10 - Microsoft Community

A workaround, but at leased something.

I had the same problem after upgraded Windows 7 Pro to Windows 10. Local network was just fine, I was pinging fine and connecting everything on the same subnet, just cannot connect to other networks....

I have the same problem. I cannot edit protocols properties for dial-up VPN interfaces. For some of the connections I need to customize DNS, for another disable default gateway. Both are crucial for...