网上的方法是 修改sshd的配置文件 /etc/ssh/sshd_config
步骤如下：
cd到etc/ssh目录
cd etc/ssh/
修改sshd_config的写权限：
sudo chmod 777 sshd_config
修改sshd_config
vi sshd_config
在sshd_config的末尾加入以下内容
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,[email protected],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,[email protected]
保存sshd_config
重启linux
reboot