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[R4kk00n <r4kk00n@xxxxxxxxx>]

After some tinkering I've found a somewhat different workaround (of you
might call it a fix) and a probable immediate cause of this behavior.

My VPN server has an address of 192.168.17.1 and it assings a range 192.168.17.33 - 192.168.17.62 to clients. I used to manually add the following routes (this is supposed to like the relevant dialog):
	Address			Netmask		Gateway		Metric
	192.168.17.0	255.255.255.0	192.168.17.1	1
	172.16.32.0		255.255.252.0	192.168.17.1	1

This did work because (I believe, cannot really bother with testing now)
Network Manager or PPTP plugin added a route to the VPN gateway
(192.168.17.1 in my case). And it no longer does. Without this route
further routes are considered invalid. This here might be a bug or it
might have been redesigned — I don't know.

Luckily there is way to enter link scoped routes in that dialog, although unintuitive: you just leave the "Gateway" field empty. Like this:
	Address			Netmask		Gateway		Metric
	192.168.17.0	255.255.255.0					1
	172.16.32.0		255.255.252.0					1
The "OK" button turns inactive after you delete a gateway, so you have to tab or click some other field for it to come back.

After this the connection works and the following routes get added to the routing table:
	> ip route
	default ...
	<vpn gateway external ip> via <your usual first hop router>
	...
	172.16.32.0/22 dev ppp0  proto static  scope link  metric 1 
	192.168.17.0/24 dev ppp0  proto static  scope link  metric 1 
	192.168.17.35 dev ppp0  proto kernel  scope link  src 192.168.17.35  metric 50 
	...

Hope this helps someone else

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager-pptp in Ubuntu.
https://bugs.launchpad.net/bugs/1511330

Title:
  PPTP connection does not establish due to error: "Connection
  activation failed: the VPN service returned invalid configuration."

Status in network-manager-pptp package in Ubuntu:
  Confirmed

Bug description:
  The PPTP connection in question used to work on Vivid, now it does not
  connect after an upgrade to Wily.

  That error description in the title comes from nmcli; it looks
  somewhat different in the notification popup

  The relevant piece of syslog is in the attached syslog-snippet.txt

  I'd say that the IP config as stated in the log looks valid to me

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: network-manager-pptp 0.9.10.0-1ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Oct 29 14:07:01 2015
  InstallationDate: Installed on 2015-08-20 (69 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  SourcePackage: network-manager-pptp
  UpgradeStatus: No upgrade log present (probably fresh install)

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