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The OpenSSH configuration setting for this is named ProxyJump.

If your connection fails after working for some time, it could be because your tokens have expired. You can check them:

$ tsh status
> Profile URL:  https://shell.ecmwf.int:443
  Logged in as: firstname.lastname@ecmwf.int
  Cluster:      shell.ecmwf.int
  Roles:        *
  Logins:       ab0
  Valid until:  2020-06-22 23:26:30 +0100 BST [EXPIRED]
  Extensions:   permit-agent-forwarding, permit-port-forwarding, permit-pty

See the Legacy Configuration note below if your ssh client is older than 7.3.

Destination Hosts available

Destination The hosts available through the Teleport gateway are:

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