OpenVPN secret

[zkab]

I have LMDE (3.2.0-3-amd64) with Cinnamon 1.6.4
Also installed (all with ver 0.9.4.0):

openvpn
network-manager-openvpn
network-manager-openvpn-gnome

I configured an openvpn connection with Network GUI to a vpn-server (that I don't control).
Downloaded:

xxx.se.ca.crt
xxx.ta.key
xxx.ovpn

from the server provider which I used in the configuration.
But I receive an error when trying to connect ... invalid VPN secrets.
Have restarted openvpn, network-manager and even rebooted ... still the same sad error.

Is the error on my side or on the server side ?
How can I debug ... I am starting the connection with Network GUI icon in the panel.