[bqmjjx0kac]

I thought TRAMP overrides that setting in your SSH config.

> TRAMP uses the ControlMaster=auto OpenSSH option by default, if possible. However, it overwrites ControlPath settings when initiating ssh sessions. TRAMP does this to fend off a stall if a master session opened outside the Emacs session is no longer open. That is why TRAMP prompts for the password again even if there is an ssh already open.

https://www.gnu.org/software/emacs/manual/html_node/tramp/Ss...

[dietr1ch]

It does and it becomes a bit annoying if you were already persisting sessions, but you can just tell emacs to use the same sockets that ssh sets up.