/etc/systemd/system/vncserver@:4.service
[Service]
Type=forking
User=eman

# Clean any existing files in /tmp/.X11-unix environment
ExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'
#ExecStartPre=-/usr/bin/vncserver -kill %i
ExecStart=/usr/bin/vncserver %i
PIDFile=/home/eman/.vnc/%H%i.pid
ExecStop=-/usr/bin/vncserver -kill %i

[Install]
WantedBy=multi-user.target

systemctl status vncserver@:4.service
vncserver@:4.service - Remote desktop service (VNC)
Loaded: loaded (/etc/systemd/system/vncserver@:4.service; disabled; vendor preset: disabled)
Active: failed (Result: timeout) since Mon 2017-11-27 09:23:08 EST;
Process: 4055 ExecStart=/usr/bin/vncserver %i (code=exited, status=0/SUCCESS)
Process: 4041 ExecStartPre=/bin/sh -c /usr/bin/vncserver -kill %i > /dev/null 2>&1 || : (code=exited, status=0/SUCCESS)
Nov 27 09:23:05  tracker-miner-user-guides.desktop[4663]: OK
Nov 27 09:23:05  tracker-miner-apps.desktop[4668]: Received signal:15->'Terminated'
Nov 27 09:23:05  tracker-miner-apps.desktop[4668]: OK
Nov 27 09:23:05  tracker-miner-fs.desktop[4672]: Received signal:15->'Terminated'
Nov 27 09:23:05  tracker-extract.desktop[4684]: Received signal:15->'Terminated'
Nov 27 09:23:05  abrt-applet[4657]: abrt: Fatal IO error 11 (Resource temporarily unavailable) on X server :15.
Nov 27 09:23:05  tracker-miner-fs.desktop[4672]: OK
Nov 27 09:23:08  systemd[1]: Failed to start Remote desktop service (VNC).
Nov 27 09:23:08  systemd[1]: Unit vncserver@:4.service entered failed state.
Nov 27 09:23:08  systemd[1]: vncserver@:4.service failed.