Bir Sur VNC question

Greetings, Claus!

Thanks for reaching out ton the Apple Support Communities! It sounds like you're having issues using third party software to screen share with your Mac minis. Does this happen with the screen sharing software built into the Mac?

Please start by following these steps to Turn Mac screen sharing on or off on all computers. Then, check out this article for How to turn your Mac on or off and restart both computers.

Once restarted, use the first article and re-enable all the settings on both computers to screen share and try to Share the screen of another Mac.

Let us know the results and have a great day!

I have this issue with the internal VNC Client. The Computer doesn't even appear as a network device in the finder.

Once I log in on the machine, it becomes visible on the network.

Very strange behavior - makes it impossible to run the machine headless.

You might be right there - it could be some kind of start-up security.

Strangely enough before I log on, the machine doesn't publish

anything via bonjour as well. It is in Apple-Stealth mode, so to say.

After an initial logon it continues to be visible/accessible via

screen sharing.

I have had the same issue. I have a 2019 16inch mbp. I generally use real VNC for

the server software. I uninstalled it and turned on screen sharing in the sharing preferences, thinking maybe the built in remote client might load as a service before the login screen would appear but it didn’t. I know this is a security measure but it would be a real problem if one was off site and the power went out and the Mac restarted. There is no access to that computer. I would hope there might be an option to allow remote control of the Mac at the login screen in a future update.

I don't have that software, but it sounds like an intended security measure in Big Sur; you might want to check with the developer(s). Apple has implemented a whole slew of new security measures and you actually also have to enable booting from an external by going to recovery > security settings. No idea, but try that as a test since you are treating the Mini like an external (so to speak) if booting it remotely.