Tiger vnc shows dark screen after connecting

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I've followed the instructions shown on the link below to install tigervnc on a Red Hat 8 Enterprise server.

https://www.tecmint.com/install-and-configure-vnc-server-in-centos-7/

However, when I connect to the server from a windows vnc client, I just get a black display with a only a mouse pointer working. This seems to be a fairly common problem, but everything I've googled so far doesn't seem to help / apply.

There is one error message in the log file that could be the problem:

Failed to import environment: Process org.freedesktop.systemd1 exited with status 1

Here's the entire log file:

Xvnc TigerVNC 1.9.0 - built Jan 28 2020 09:21:11
Copyright (C) 1999-2018 TigerVNC Team and many others (see README.rst)
See http://www.tigervnc.org for information on TigerVNC.
Underlying X server release 12003000, The X.Org Foundation

Thu Mar 26 10:48:35 2020
vncext: VNC extension running!
vncext: Listening for VNC connections on all interface(s), port 5901
vncext: created VNC server for screen 0
Failed to import environment: Process org.freedesktop.systemd1 exited with status 1

Thu Mar 26 10:48:38 2020
ComparingUpdateTracker: 0 pixels in / 0 pixels out
ComparingUpdateTracker: (1:-nan ratio)

Thu Mar 26 11:03:41 2020
Connections: accepted: 192.168.0.17::2372
SConnection: Client needs protocol version 3.8
SConnection: Client requests security type VncAuth(2)

Thu Mar 26 11:03:48 2020
VNCSConnST: Server default pixel format depth 24 (32bpp) little-endian rgb888

Any thoughts/ideas would be most welcome.

MD

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