How to connect to x11vnc server on Linux from OS X (macOS)?

Building off prior answer, but too long for a comment. In MacOS Big Sur 11.1, I get better performance with this:

x11vnc -display :0 -noxrecord -forever -passwd 123456

By removing -noxdamage, I see both a decrease in drawing latency and far fewer tears when resizing or minimizing windows in x11. Removing -noxfixes make a much better experience as well, because the cursor displays properly – including when the x11 cursor changes shape (e.g. to resize a window). This is very handy, otherwise you will be constantly guessing if your cursor is properly over the reside selection box. No noticeable difference (to me) from removing noxrecord, so I left it in

While the -ncache option does successfully connect, I was unable to mix ncache and multiple desktop windows. This appears to be an unexpected artifact of how desktop windows are implemented (in Y-coords, windows are "under" the main one) that conflicts with how ncache works (by also using duplicate windows under the main one).

I used the following to set up connections to remote systems, even those using slow internet.

x11vnc -rfbport 5900 -bg -o ~/.vnc/log -rfbauth ~/.vnc/passwd -ncache 0 -speeds modem -forever -shared -ultrafilexfer -skip_lockkeys -desktop <RemoteComputer>

This starts a VNC daemon that:

• Sets the port to 5900 (default), but you could change it here, rfbport
• runs the server in the background, bg.
• logs what’s going on, o.
• uses a password sored as encrypted hash, rfbauth.
• disables pixel cache, an issue on OSX, ncache.
• adapts data transfer to low speeds, speeds modem.
• does not close the connection once you’re done, forever.
• accepts an unlimited amount of connections, shared. That’s a thing, e.g., when your actual connection breaks and the server did not close it yet, you wouldn’t be able to reconnect right away.
• enable file sharing acc.to ultravnc, ultrafilexfer. Does not seem to work with macs though.
• ignores lock keys of the remote computer like caps lock etc., skip_lockkeys.
• and gives your remote computer a name, desktop.

You can set an encrypted password via

x11vnc -storepasswd

And stop the server via a simple kill signal (-SIGTERM). Enjoy!