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ssh: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1

If you run into a key exchange issue with ssh it probably means the server you are connecting to has an older cipher.

To fix a diffie-hellman-group1-sha1 problem try the following command:

ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 “server-ip”

You can do the same thing with other ciphers by replacing diffie-hellman-group1-sha1 with the offending cipher type.