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- VirtualBox 6.1.28 has network problems on OSX Big Sur
- VirtualBox does not run at all on OSX Montery

All in this post is about OSX on an Intel machine, no VirtualBox on A1.

Network problems on OSX Big Sur

Docker containers cannot connect to a database running on VirtualBox through a dedicated host network.
Solution: do not upgrade to VirtualBox 6.1.28

VirtualBox problems on OSX Monterey

Virtual instances (VirtualBox 6.1.26) do not start.

On (every) reboot, execute (as described in this topic):

sudo kextload -b org.virtualbox.kext.VBoxDrv
sudo kextload -b org.virtualbox.kext.VBoxNetFlt
sudo kextload -b org.virtualbox.kext.VBoxNetAdp
sudo kextload -b org.virtualbox.kext.VBoxUSB

Furthermore, you might need to add your host network adapters again (in my case I had three);

And lastly, start your instances in normal mode. Instances do not start in headless mode anymore, only in normal mode.

Hope this helps you!