How to close (kill) ssh ControlMaster connections manually

With the following .ssh/config configuration: ControlMaster auto ControlPath /tmp/ssh_mux_%h_%p_%r ControlPersist 4h How to close the persisting connection before the 4 hours? I know you can make new connections, but how to close them (all)? Maybe there is a way to show all the persisted connections and handle them individually but I can not find it.