Known issue when launching VNC Server in Windows 10/11

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We are aware of an issue currently affecting some Windows 10/11 users where the VNC Server process fails shortly after launching; the VNC icon also fails to show in the system tray. If you experience this, you can check the Event Viewer in Windows - searching for "VNC Server" - to find the exact error code. It should look similar to this:

Faulting application name: vncserver.exe, version: 6.10.0.47347, time stamp: <xxxxxx>
Faulting module name: vncserver.exe, version: 6.10.0.47347, time stamp: <xxxxxx>
Exception code: 0xc0000409
Fault offset: 0x0000000000432695
Faulting process id: 0x16cc
Faulting application start time: <xxxxxxxxxx>
Faulting application path: C:\Program Files\RealVNC\VNC Server\vncserver.exe
Faulting module path: C:\Program Files\RealVNC\VNC Server\vncserver.exe

Our initial investigations suggest that this may be related to the recent Windows Update KB5015807.  This update has some known issues involved printing, noted on https://support.microsoft.com/en-au/topic/july-12-2022-kb5015807-os-builds-19042-1826-19043-1826-and-19044-1826-8c8ea8fe-ec83-467d-86fb-a2f48a85eb41.

While our developers continue to investigate, a workaround for now is to disable the remote printing feature in VNC Server. You can disable remote printing by following these steps:

  1. Open Registry Editor
  2. Navigate to the key HKEY_LOCAL_MACHINE\Software\RealVNC\vncserver
  3. Create a new String value named EnableRemotePrinting
  4. Set it to a value of  0
  5. Try starting VNC Server again
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