The connection is between my Win10 laptop (build 10586.71) and my home Buffalo router. The connection worked fine before from Windows 7, and it still works via my android phone (6.0.1). But now, when I try to connect, I get "The PPP link control protocol was terminated."
Click image for larger version. 

Name:	pptp link term.png 
Views:	3 
Size:	5.9 KB 
ID:	61908

The settings on the phone, which work are:
Type: PPTP
<checked> PPP encryption (MPPE)

Here are the error messages from the Event Viewer