[lubuntu] x11vnc server is not quitting after use topic

I've installed x11vnc server on my Trusty machine. I connect through SSH with a command like this:

Code:

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ssh -L  5900:localhost:5900 remotehost 'x11vnc -localhost -display :0'

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But if I press Ctrl+C in the local terminal, x11vnc does not stop properly. Running ps aux on the remote system shows several instances still running. What is the correct way to stop it?