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by xk3 629 days ago
closing ssh doesn't close the ports if they are being used, at least with ControlMaster. You need to run something like this to force the ssh daemon to close the port

    ssh -O cancel -L 4102:localhost:4000 pc
but if ControlMaster is stuck maybe autossh is better in that case, or use this:

    Host *
        ServerAliveInterval 11