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
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https://bugs.launchpad.net/bugs/1511330
Title:
PPTP connection does not establish due to error: "Connection
activation failed: the VPN service returned invalid configuration."
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