The issue I have is definitely related to ConnMan. Here is what I did to prove it and get the PPTP client to work:
I disabled Connection Manager with:
systemctl disable connman.service
and installed Network Manager with:
sudo apt-get install network-manager
then I edited /etc/network/interfaces - added my network config:
iface eth0 inet static
address 192.168.0.101
netmask 255.255.255.0
gateway 192.168.0.1
after these changes my PPTP client started working correctly.
Now my question to developers (@sam_nazarko and @DBMandrake) is: will this setup work long term, or will I have any problems?
I’d really love to see the PPTP client work with ConnMan, but I’m rather a beginner in linux world, so if someone can guide me, I can continue troubleshooting the connman and my pptp setup.