Formuler Z10 and VPN

i am unable to get my formuler to work with openvpn.

i installed the openvpn app from the playstore and imported my ovpn file.

i can still use youtube when it's connected so i know the internet connection is fine.

but when i try to start mytvonline i get a retrying network error followed by "check your internet connection."

is there a way to get this to work?