Unable to negotiate

ssh -V
OpenSSH_8.2p1 Ubuntu-4ubuntu0.2, OpenSSL 1.1.1f  31 Mar 2020
ssh -o PreferredAuthentications=keyboard-interactive -o PubkeyAuthentication=no [email protected]
Unable to negotiate with 10.10.10.2 port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

ssh -V
OpenSSH_7.9p1, LibreSSL 2.7.3
ssh -o PreferredAuthentications=keyboard-interactive -o PubkeyAuthentication=no [email protected]
ssh_dispatch_run_fatal: Connection to 10.10.106.6 port 22: Invalid key length

See also

• SSH: ssh, TLS, .ppk, .pem, .crt, .pub, ED25519, Key exchange method (KEX), public key, private key, ssh -Q kex, IAMUserSSHKeys, known_hosts, ssh tunnel, Dropbear