Hello,

Note: Server is Centos 7.

I've been starting my Xvnc server as a non-privileged user in the following 
way: "TVNC_WM=mate-session /opt/TurboVNC/bin/vncserver". For a while, this 
was enough to allow me to connect via TurboVNC Viewer. Recently however, 
when I connect to this server, I have been getting an error from the VNC 
Viewer GUI:

"Could not connect to session bus: Failed to connect to socket 
/tmp/dbus-<unique string>: Connection refused"

Followed by another popup in TurboVNC Viewer:

"Could not acquire name on session bus"

I don't see any errors in the appropriate ~/.vnc/*.log files, I do see 
errors in /var/log/messages:
May  4 10:22:53 cn9999 mate-session[1556]: WARNING: Could not make bus 
activated clients aware of XDG_CURRENT_DESKTOP=MATE environment variable: 
Could not connect: Connection refused
May  4 10:22:53 cn9999 mate-session[1556]: WARNING: Could not make bus 
activated clients aware of DISPLAY=:1 environment variable: Could not 
connect: Connection refused
May  4 10:22:53 cn9999 mate-session[1556]: WARNING: Could not make bus 
activated clients aware of MATE_DESKTOP_SESSION_ID=this-is-deprecated 
environment variable: Could not connect: Connection refused
May  4 10:22:53 cn9999 mate-session[1556]: dconf-WARNING: failed to commit 
changes to dconf: Could not connect: Connection refused
May  4 10:22:53 cn9999 mate-session[1556]: WARNING: Could not make bus 
activated clients aware of SESSION_MANAGER=local/unix:@/tmp/.ICE-unix/1556,
unix/unix:/tmp/.ICE-unix/1556 environment variable: Could not connect: 
Connection refused


When I start the VNC server in the same way as root, I'm able to start a 
mate session and work with a desktop.

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