no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1 code example
Example: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1
ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 123.123.123.123