I don’t understand the “arv” reference, but maybe it will help to know that I’ve seen weirdness like that when the Mac is connected to both WiFi and Ethernet. Leave WiFi on for airdrop purposes, but “forget network” so it doesn’t connect and see if that helps.
This may also resolve the headless issue, assuming you have “Wake for Network Access” turned on, as the magic packets might be getting lost.
Afternoon, as in see you Saturday arvo . It is often used in the phrase this arvo , which is sometimes shortened to sarvo : meet you after the game, sarvo . Arvo is an example of a special feature of Australian English, the habit of adding -o to an abbreviated word. Other such words are bizzo ‘business’ and journo ‘journalist’. First recorded in the 1920s and still going strong today.
So it looks like you can’t run the machine headless if FileVault is turned on (because it won’t auto-login).
Turn it on and have it automatically log into a low level account (and with suitable lock screens, etc) is a solution, if a little less secure, I guess.
If the computer is physically located in a secure location (e.g. your home, where you trust the people living there), you may want to disable FileVault.
FV is only meaningful in the event that the computer is physically stolen or is kept powered-off in a place where you can’t trust those with access, since the storage will unlock after the first login.
If you auto-login, then that means FV is disabled.
If you secure your remote access (e.g. suitable access credential requirements, firewalls, etc.), you should be fine.
If, however, your circumstance is that you can’t do this, an alternative would be to get a KVM switch that provides remote access, so you can remotely log in to the locked system. But these devices are not cheap and may actually cost more than that Mac mini.
And, of course, if a KVM is used, you still need physical security, because your access will be driving the device’s console, so anybody with access to the real console will see what you’re doing and will be able to use that console whenever you’re (remotely) logged in.