Hi!

Yes, the dreaded Apple Firewall bug:( The cause is that somehow the firewall would block macOS's own bootpd process and that it the process responsible for handing out IP addresses to the virtual machine instances. We could never find out why macOS chose to block bootpd though.

Anecdotally, the number of users mentioning this issue have been much less lately, but I'm not sure if that is because the new Multipass release which has a newer QEMU made it better, a macOS update fixed it, or users have just given up.