Your image does not support the VPNService API, sorry
![Sad :(](./images/smilies/icon_e_sad.gif)
If you did not get a VPN confirmation dialog, you have "Always on VPN" enabled for another app. In that case only that app is allowed to connect to a VPN. Check under Settings-> Networks more .. -> VPNS
It is working fine in my Linux and Windows. What should I do to fix this?