Brice Waegeneire <brice@waegenei.re> writes:

> “guix deploy” bugs; they keep coming! “guix deploy” doesn't make use of SSH
> channels[0], instead it close the SSH session each time after sending store
> items.

Did you try a built in SSH's “Control*” feature?

ssh_config (0)

  ControlMaster auto
  ControlPath ~/.ssh/master-%r@%h:%p
  ControlPersist yes