ssh rsa got you down? (Unable to negotiate with X.y.Z.1 port 22: no matching host key type found. Their offer: ssh-rsa,ssh-dss) - i.e. sorry I can't do that Dave?

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Chuck this in your ~/.ssh/config :
Host X.y.Z.1
    User da-user
    PubkeyAcceptedAlgorithms +ssh-rsa
    HostkeyAlgorithms +ssh-rsa