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As reported earlier at https://lists.mindrot.org/pipermail/openssh-unix-dev/2011-March/029441.html there is some strange interaction between ControlPersist and ssh -W that breaks things if you're using both. Specifically, ssh -W host:port with ControlPersist enabled opens up two connections to host:port and sends data from both back. I think this is happening because

These patches implement a new mux client request to list the currently opened TCP forwardings. It also removes some todos regarding keeping the list of forwardings in the options up-to-date. Bert Wesarg (6): attach the forwarding type to struct Forward merge local and remote forward lists generate unique ids for forwardings to be used for identification remove closed forwardings from