3DConnexion SpaceMouse / Space Pilot Keys (Ctrl, Alt, ESC,..) are not working in a Citrix HDX 3D Pro Session

If you passthrough a 3DConnexion SpaceMouse to a Citrix HDX 3D Pro Session you expect that everything is working like on a local computer. Unfortunately that’s not always the truth. It might happen that the left side of Keys (Ctrl, Alt, ESC,…) are not working. Everything else instead is working fine. When you look at the release notes of XenDesktop 7.11 you find the following fix:

Customized functions for a 3DConnexion SpaceMouse might not work in a VDA session.
[#LC4797]

When you now think – ok let’s upgrade to 7.11 (or one version later) and the problem is gone – that might help you – but did not help us. Thus we created a ticket at Citrix. They told me that the following Registry-Key also needs to be added:

Path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\picakbf
Key: Enable3DConnexionMouse
Type: REG_DWORD
Value: 1

After adding the key you need to reboot your VDA. Now the 3DConnexion Mouse should fully work. As far as I know this is not documented anywhere else….