macOS Terminal – How to Add a Proxy

You may need tunneling technique for accessing an HTTP proxy using SSH tunneling check this link: http://kimmo.suominen.com/docs/proxy-through-ssh/

You can tell if it's enabled by running launchctl list | grep '^\d.*RemoteDesktop.*'. That will output a line if there's an active process for the RemoteDesktop agent, and will output nothing if not. There's an active process for the agent whenever Remote Management is enabled, even if there's no active connection (unlike something like Screen Sharing, where the process is only active when there's a connection made).