Login into your Kubernetes master and add this /etc/ssh/sshd_config
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group1-sha1
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha1,hmac-md5,hmac-sha1-96,hmac-md5-96
After it restart ssh
systemctl restart ssh
systemctl restart sshd