vim /etc/ssh/sshd_config Ciphers aes128-cbc,aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr,3des-cbc,arcfour128,arcfour256,arcfour,blowfish-cbc,cast128-cbc MACs hmac-md5,hmac-sha1,umac-@openssh.com,hmac-ripemd160,hmac-sha1-,hmac-md5- KexAlgori