TigerVNC installation on CentOS 7 (as in Red Hat System Administrator's Guide )

I want to install TigerVNC on my freshly installed CentOS 7 server, version centos-release-7-4.1708.el7.centos.x86_64. So besides other tutorials I've tried already, I followed the Red Hat guide. However with variable error messages depending on the tutorial I never got the service to start. The following is exactly what I did on a new installation of CentOS 7: yum install tigervnc-server cp /usr/lib/systemd/system/vncserver@.service /etc/systemd/system/vncserver@.service vi /etc/systemd/system/vncserver@.service initial file content: [Unit] Description=Remote desktop service (VNC) After=syslog.target network.target [Service] Type=forking User= # Clean any existing files in /tmp/.X11-unix environment ExecStartPre=-/usr/bin/vncserver -kill %i ExecStart=/usr/bin/vncserver %i PIDFile=/home//.vnc/%H%i.pid ExecStop=-/usr/bin/vncserver -kill %i [Install] WantedBy=multi-user.target file content after edit: [Unit] Description=Remote desktop service (VNC) After=syslog.target network.target [Service] Type=forking User=root # Clean any existing files in /tmp/.X11-unix environment ExecStartPre=-/usr/bin/vncserver -kill %i ExecStart=/usr/bin/vncserver %i PIDFile=/home/root/.vnc/%H%i.pid ExecStop=-/usr/bin/vncserver -kill %i [Install] WantedBy=multi-user.target Instructions after file edit: systemctl daemon-reload su - root vncpasswd systemctl start vncserver@:1.service Job for vncserver@:1.service failed because a timeout was exceeded. See "systemctl status vncserver@:1.service" and "journalctl -xe" for details. [root@localhost ~]# systemctl status vncserver@:1.service ● vncserver@:1.service - Remote desktop service (VNC) Loaded: loaded (/etc/systemd/system/vncserver@.service; disabled; vendor preset: disabled) Active: failed (Result: timeout) since Wed 2018-01-03 09:00:17 UTC; 22s ago Process: 2045 ExecStart=/usr/bin/vncserver %i (code=exited, status=0/SUCCESS) Process: 2040 ExecStartPre=/usr/bin/vncserver -kill %i (code=exited, status=2) Jan 03 08:58:50 localhost vncserver: New 'localhost:1 (root)' desktop is localhost:1 Jan 03 08:58:50 localhost vncserver: Creating default startup script /root/.vnc/xstartup Jan 03 08:58:50 localhost vncserver: Creating default config /root/.vnc/config Jan 03 08:58:50 localhost vncserver: Starting applications specified in /root/.vnc/xstartup Jan 03 08:58:50 localhost vncserver: Log file is /root/.vnc/localhost:1.log Jan 03 08:58:50 localhost systemd[1] : PID file /home/root/.vnc/localhost:1.pid not readable (y...art. Jan 03 09:00:17 localhost systemd[1] : vncserver@:1.service start operation timed out. Terminating. Jan 03 09:00:17 localhost systemd[1] : Failed to start Remote desktop service (VNC). Jan 03 09:00:17 localhost systemd[1] : Unit vncserver@:1.service entered failed state. Jan 03 09:00:17 localhost systemd[1] : vncserver@:1.service failed. Hint: Some lines were ellipsized, use -l to show in full. Does anyone have a clue how I can solve this?