Cannot configure VNC Server on Windows Server 2012 R2

I found these instructions by searching Google for "ubuntu launch vnc server on startup".

1. Install the VNC server.
2. Launch vncserver for the first time to set up a password.
3. Add the following file as /etc/init.d/vncserver (be sure to modify the USER, GEOMETRY, NAME, etc. to your liking).
4. sudo chmod +x /etc/init.d/vncserver
5. sudo update-rc.d vncserver defaults

/etc/init.d/vncserver

#!/bin/sh -e
### BEGIN INIT INFO
# Provides:          vncserver
# Required-Start:    networking
# Default-Start:     S
# Default-Stop:      0 6
### END INIT INFO

PATH="$PATH:/usr/X11R6/bin/"

# The Username:Group that will run VNC
export USER="mythtv"
#${RUNAS}

# The display that VNC will use
DISPLAY="1"

# Color depth (between 8 and 32)
DEPTH="16"

# The Desktop geometry to use.
#GEOMETRY="<WIDTH>x<HEIGHT>"
#GEOMETRY="800x600"
GEOMETRY="1024x768"
#GEOMETRY="1280x1024"

# The name that the VNC Desktop will have.
NAME="my-vnc-server"

OPTIONS="-name ${NAME} -depth ${DEPTH} -geometry ${GEOMETRY} :${DISPLAY}"

. /lib/lsb/init-functions

case "$1" in
start)
log_action_begin_msg "Starting vncserver for user '${USER}' on localhost:${DISPLAY}"
su ${USER} -c "/usr/bin/vncserver ${OPTIONS}"
;;

stop)
log_action_begin_msg "Stoping vncserver for user '${USER}' on localhost:${DISPLAY}"
su ${USER} -c "/usr/bin/vncserver -kill :${DISPLAY}"
;;

restart)
$0 stop
$0 start
;;
esac

exit 0

In general that simply means that it shows the display as it is - most Windows VNC implementations seem to use port 5900, and the port can be an arbitrary number - you just have to match up the port that the VNC server is set to to the client.

There's a bit more to it though - Linux allows you to have virtual displays, and you can connect a separate X session via VNC. Since each VNC session has to have its own session, it's a convention to simplify things - you can connect port 5900 to a virtual display and it will work. It's just simpler to remember the default port + display number.