On 14.04 experiencing the same problem. After I try to connect to my VPN
in a matter of a few seconds after the successful connection I get
disconnected. Following this post http://tdanas.blogspot.co.uk/2015/01
/ubuntu-vpn-connects-successfully-and.html I decide to see what are my
routing tables while the connection is on. Results are:

Destination          Gateway          Genmask                 Flags Metric Ref  
  Use Iface
default                   *                         0.0.0.0                     
 U         0      0        0 ppp0
cyrano2.cs.ucl.    172.17.31.1     255.255.255.255   UGH   0      0        0 
wlan0
cyrano2.cs.ucl.    172.17.31.1     255.255.255.255   UGH   0      0        0 
wlan0
winvpn11.cs.ucl  *                         255.255.255.255   UH      0      0   
     0 ppp0
172.17.31.0          *                         255.255.255.0        U         9 
     0        0 wlan0

I do not know how it works but having a duplicate entry in the routing
table might be the cause of the problem.

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https://bugs.launchpad.net/bugs/991666

Title:
  VPN Connects Successfully & Then Shortly Thereafter Fails

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