Please try the network-manager-pptp package from the NM trunk PPA here: https://edge.launchpad.net/~network-manager/+archive/trunk. It contains fixes for saving MPPE settings, as well as a patch to the UI to not allow chosing auth methods that don't support MPPE.
Please try the network- manager- pptp package from the NM trunk PPA here: https:/ /edge.launchpad .net/~network- manager/ +archive/ trunk. It contains fixes for saving MPPE settings, as well as a patch to the UI to not allow chosing auth methods that don't support MPPE.