Mac

MindMap

Configure

macOS Remote access
configure remote access | article

Debugging VNC

Ping

First ping the host IP address to make sure you can access it.

PING 10.21.24.21

SSH

Do ssh to the macOS server to check whether you can login properly.

Connection timeouts

Timed out waiting for a response from the computer

I did restart of the VNC / ARD service as well to debug this issue.
No avail.
Tried to connect via public IP as well, didn't work.

configure firewall

How to Fix VNC Error: “Timed out waiting for the response from the host computer”

VNC Errors

realVNC error messages

known issues for macOS | VNC

Monitor

Clients

Monitor the remote connected clients to the server

# monitor via process name
netstat -a | grep vnc

# Monitor via Port address
netstat -na | grep '[:.]5900'

Service

Status of VNC service

ps -e | grep ARDAgent

Restart

VNC Service

sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart \
-activate -configure -access -on \
-clientopts -setvnclegacy -vnclegacy yes \
-clientopts -setvncpw -vncpw mypasswd \
-restart -agent -privs -all

Good github gist of enabling, restarting the macOS vnc server via CLI commands.

github gist source

Mac

apple support guide

Shutdown command

sudo shutdown -r now

Mount DMG

CLI
How-to-install-dmg-and-dkg-on-mac-via-terminal

SE | is-there-a-command-to-install-a-dmg

Force quit

Press these three keys together: Option (or Alt), Command, Esc (Escape). Or choose Force Quit from the Apple menu  in the corner of your screen. The Finder is always open, but if it stops responding, you can force it to quit and then open again: Select Finder in the Force Quit window, then click Relaunch

Disable iBoss Proxy

cd /Applications/Utilities/iboss.app/gen4agent/
# disable
./reconfigure.sh unload

# enable
./reconfigure.sh load

Retrieve Serial number

system_profiler SPHardwareDataType | awk '/Serial/ {print $4}'

Stack exchange post

disable sleep

X would be the seconds

caffeinate -t X 

# Does it infinitly
caffeinate -d

Also could set the power management to disable sleep using Command Line

Use 0 to reenable sleep.

sudo pmset disablesleep 1

Read more about utilities wrapper around sleeping mac

Additionally, if you have an application full screen - the system should never sleep the display or go to screensaver. Have to test this out though!
Or you could plug in hdmi dummy to keep the GPU or mac alive | consumes more power though.