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-64@openssh.com,hmac-ripemd160,hmac-sha1-96,hmac-md5-96
KexAlgorithms diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group1-sha1,curve25519-sha256@libssh.org
将#PasswordAuthentication yes的注释去掉
将#PermitRootLogin yes的注释去掉
然后重启sshd
service sshd restart
但我在重启ssd时不成功，于是
查看ssh服务状态
/etc/init.d/ssh status
发现是最后一个算法不能识别，于是把上面KexAlgorithms一行最后一个红色标记的算法去掉，重启成功，也能远程连接。
参考https://blog.csdn.net/jiandanjinxin/article/details/69943563