SSH multiplexing + control master when network connection changes

I have a computer server and a laptop guest, both running Ubuntu. I set SSH multiplexing and control master in the laptop's .ssh/config like the following: Host servername User username Port 22 HostName servername.ddns.net ControlMaster auto ControlPersist 1h ControlPath /tmp/ssh_mux_%r@%n:%p When the laptop connects to the server via ssh servername.ddns.net, a control file is created. However, if the laptop exists the connection to the server and tries to connect again while using a different Wifi network, the ssh attempt hangs. I suppose because there's some conflict with the control file that was created originally. How could I set up SSH multiplexing and control master in a way that is robust to connecting and re-connecting to the server using different WiFi networks?