OpenSSH Legacy Options

Unable to negotiate with legacyhost: no matching key exchange method found.
Their offer: diffie-hellman-group1-sha1

$ ssh -oKexAlgorithms=+diffie-hellman-group1-sha1

Unable to negotiate with port 22: no matching host key type found. Their offer: ssh-dss

$ ssh -oHostKeyAlgorithms=+ssh-dss

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