Ubuntu SSH Algorithm negotiation faile


The Way to resolve

  1. Use a different system or the console to drop to a shell. Such as Putty

  2. Chmod 777 & Edit the “/etc/ssh/sshd_config” file

  3. Add all of the algorithm negotiation to sshd_config

  4. Restart sshd sevice
    Add following code to sshd_config

  5. 在sshd_conf文件里面加入如下code

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

注：最好粘贴至记事本清除格式且将倒数三行修改为一行

root@ubuntu:/home/app# chmod 777 /etc/ssh/sshd_config
root@ubuntu:/home/app# vi /etc/ssh/sshd_config
root@ubuntu:/home/app# service sshd restart

Finally

Congratulations! you have success resolved Algorithm negotiation failed