UltraVNC

Headless systems doesn't seem to activate the video card and that(s required for vnc to work.
This change is in win11 and latest win10, before you always had as some display.
The OS give a random value back as display, this was crashing the server, in latest version the crash should be solved, but ...

I use UltraVNC 1.4.3.1 x64
I register all PCs by waking them up via Wake on Lan. The monitor is switched off.
I have the following error on a Windows 11 PC (let's call it PC "A") with a KVM switch (ATEN 2-Port USB HDMI KVM Switch w/Audio) which connects two PCs with one mouse, keyboard and only ...

Hi, I have a similar problem and the cause is a KVM switch (which connects two PCs with a monitor, mouse and keyboard).
When the switch is on the other PC turned off, the behavior occurs.
If the switch is switched, the error is gone.
Maybe this helps you with troubleshooting.