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Ubuntu VNC with XDMCP Black Screen

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I have a ubuntu 22.04 LTS system with the following setup: I have a Systemd unit with Socket Activation, basically the following:

[Service]
ExecStart=-/usr/bin/Xvnc -inetd -query localhost -geometry 1920x1080 -once -SecurityTypes=None
User=nobody
StandardInput=socket
StandardError=syslog

Backed by gdm with the following custom config:

[daemon]
WaylandEnable=false

[security]
DisallowTCP=false
[xdmcp]
Enable=true
MaxSessions=40
DisplaysPerHost=10

This used to work fine until a couple of days ago. Now all I get is a black screen when connecting though. Does anyone have an idea where to look to get this working again?

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