PolicyKit failed over headless VNC

[BunBun]

I have a fresh install of Fedora 27 XFCE inside of a Hyper-V VM. I plan to use this 100% remotely hence the headless VNC. I have installed tigervnc-server and configured it to run on :0, done a "systemctl set-default multi-user.target" and opened up the vnc-service on firewall.

The problem arrises when connecting over with tightVNC. Upon starting the session I am presented with an error box saying "XFCE PolicyKit Agent" and "GDBus.Error:org.freedesktop.PolicyKit1.Error.Fail ed: Cannot determine user of subject" and I click close to make it go away. Note that I am not asked to log in the desktop for my user is already up.

But anything that requires elevation privilege does not work now. I don't get errors, just nothing happens when I try to open say gparted or install something with the GUI software manager. Is there additional steps I need to take with VNC config to get the user working correctly with PolicyKit and VNC?

EDIT:

I have tried disabling PolicyKit on startup and adding a policy

Identity=unix-group:wheel (also tried *)
Action=*
ResultActive=yes

and still can't launch anything requiring elevation.

My xstartup in ~/.vnc/ contains

#!/bin/sh

unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
exec /etc/X11/xinit/xinitrc

I feel like something is not starting up correctly. Or this is some permissions issue with remote vs local...

[not0a0user]

Same issue with fedora 28 XFCE spin. I observed that this does not happen if I start vncserver from command line or via ssh.

Somehow the login via ssh does trigger something that prevents this issue. So my hack is to use a service file like this:

[Unit]
Description=Remote desktop service (VNC)
After=syslog.target network.target

[Service]
Type=simple
WorkingDirectory=/home/someuser
User=someuser
Group=someuser


ExecStartPre=/bin/sh -c '/usr/bin/ssh -i .ssh/id_rsa_vnchack localhost /usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'
ExecStart=/bin/sh -c '/usr/bin/ssh -i .ssh/id_rsa_vnchack localhost /usr/bin/vncserver -fg %i'
ExecStop=/bin/sh -c '/usr/bin/ssh -i .ssh/id_rsa_vnchack localhost /usr/bin/vncserver -kill %i'

[Install]
WantedBy=multi-user.target

This requires a passwordless ssh key with the corresponding pub key in your authorized_keys file, and that you did

ssh -i .ssh/id_rsa_vnchack localhost

once before and accepted your host key.

[flyingdutchman]

I'm just wondering why you want to use VNC. It is mostly a Windows thing. If your client machine runs Linux, then you will have more joy just with plain old SSH and X forwarding.

Since Ubuntu finally dropped Wayland and reverted to Xorg, SSH now works properly again.