Tiger VNC startup in RHEL 7

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OS: RHEL 7

Used the instructions here:
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/ch-TigerVNC.html

Expected behavior:
systemctl start vncserver@:4.service should report a successful start.

Actual behavior:
Job for vncserver@:4.service failed. See 'systemctl status vncserver@:4.service' and 'journalctl -xn' for details.

Workaround: start vncserver manually by USER with "vncserver" command with no arguments. This means that for every server restart, each VNC user has to SSH in and initialize a vncserver manually, figure out which port it opened on, and connect to that. Sometimes users connecting this way report only a black screen w/ a cross-pointer.

Issue: What can I do to make the config files load VNC service (with active GUI) for each user automatically at boot-up, to their assigned TCP ports?

Command line log:

sudo systemctl start vncserver@:4.service
Job for vncserver@:4.service failed. See 'systemctl status vncserver@:4.service' and 'journalctl -xn' for details.
[stanasa@localhost ~]$ sudo systemctl status vncserver@:4.service
vncserver@:4.service - Remote desktop service (VNC)
   Loaded: loaded (/usr/lib/systemd/system/vncserver@:4.service; disabled)
   Active: failed (Result: exit-code) since Wed 2014-07-30 15:26:03 EDT; 10s ago
  Process: 13245 ExecStart=/sbin/runuser -l stanasa -c /usr/bin/vncserver %i (code=exited, status=98)
  Process: 13238 ExecStartPre=/bin/sh -c /usr/bin/vncserver -kill %i > /dev/null 2>&1 || : (code=exited, status=0/SUCCESS)

Jul 30 15:26:03 localhost.localdomain systemd[1]: vncserver@:4.service: contr...
Jul 30 15:26:03 localhost.localdomain systemd[1]: Failed to start Remote desk...
Jul 30 15:26:03 localhost.localdomain systemd[1]: Unit vncserver@:4.service e...
Hint: Some lines were ellipsized, use -l to show in full.

###########
Content of /lib/ vncserver@:4.service, OWNED by root

...
[Unit]
Description=Remote desktop service (VNC)
After=syslog.target network.target
[Service]
Type=forking
# Clean any existing files in /tmp/.X11-unix environment
ExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'
ExecStart=/sbin/runuser -l stanasa -c "/usr/bin/vncserver %i -geometry 1200x900"
PIDFile=/home/stanasa/.vnc/%H%i.pid
ExecStop=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'

[Install]
WantedBy=multi-user.target


####### Content of home/USERNAME/.vnc/xstartup, owned by USERNAME
#!/bin/sh

unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS

exec /etc/X11/xinit/xinitrc &
IE

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