remote desktop - How to configure a password for LightDM VNC connection

I have ubuntu 14.04, and am using lightdm.
I want to login to the machine from another (windows) computer using VNC. By using the following /etc/lightdm/lightdm.conf I get a VNC server, but when I try to connect to it I get (using chrome realVNC or TightVNC client) an error 'Authentication reason: No password configured for VNC auth'

[SeatDefaults]
autologin-user=
user-seesion=ubuntu
greeter-session=unity-greeter
allow-guest=false
[XDMCPServer]
enabled=true
port=177
[VNCServer]
enabled=true
port=5900
width=1360
height=768
depth=24

I have used vncpasswd on the machine to set a password. However this is a password for a specific user (I think). Also 'update-alternatives --list Xvnc' points to:

• /usr/bin/Xvnc


• /usr/bin/Xvnc4