Hi,
Perhaps have you forget to set password user in configuration panel ; by example in :
*In ubuntu go to '''Network Manager > VPN Connections > Configure VPN'''. Click '''import''' then in the explorer navigate to the openvpn folder in the home directory and select the .ovpn file created previously. This should automatically load all settings into network manager.
*Add username and password of client, then you have to give the path of the '''user.p12''' key of your user and set the Private key password (the password set during the certificate creation in phpky).