I have also enabled 'Observe' & 'Control' found on the 'Options' button for the authorized user. On the Mac I have enabled a VNC password (click on 'Computer Settings' button under Remote Management). On Linux I use the following command to connect to a Mac using VNC (xtightvncviewer is being used - I believe you can just use the tightvncviewer command as well): vncviewer Plus different versions of macOS seem to behave differently. I don't have these issues when connecting to a Linux remote system.

Even when I connected to the remote Mac the graphics in the session were very slow to load and both computers are on the same LAN. When I was having trouble I was able to enter my VNC password, but a VNC window never opened. After disconnecting from the VNC session I was unable to access the remote Mac via VNC for a while. I had to try multiple times before I was able to connect. I actually was having trouble connecting to a Mac using VNC myself. So, my question is: is there a way to get the Mac to start listening on the Screen Sharing port (5900, I believe) and accept screen sharing requests after the machine boots up and before anyone logs into it? I don't want to disable File Vault and I don't want to leave the Mac running all the time. I suspect I could work around this issue by enabling auto login on the Mac, but to do that I would have to disable File Vault, which I'd rather not do. The VNC error I get before logging into the Mac seems to indicate that before that initial login the Mac is not listening on the Screen Sharing port.

Once I login, I *can* access the Mac via Bonjour or the Address Book entry I made in VNC. However, I've discovered that VNC Viewer cannot connect with the Mac after it's turned on or rebooted until after someone logs into it. How to make VNC Viewer on iPad connect with Mac (Big Sur) Screen Sharing before someone logs in? I would like to use my iPad with VNC Viewer via Screen Sharing to control my Mac Mini.

Ultravnc viewer mac