当使用 SSH 登录云服务器 ECS （Elastic Compute Server） Linux 服务器时，即便正确输入了密码，也会出现类似如下错误信息： Disconnected:No supported authentication methods available
那是因为阿里云为了安全，必须使用密钥对登陆。先要创建密钥对，接着绑定到实例，然后使用puttygen.exe将前步创建的密钥对pem文件，转换成后缀名为ppk文件，接着在putty中进行登陆，登陆成功之后。
通过 管理终端 进入系统。
通过 cat 等指令查看 /etc/ssh/sshd_config中是否包含类似如下配置：PasswordAuthentication no # 说明：该参数默认启用，默认值为 yes。
如果需要修改相关策略配置，在继续之前建议进行文件备份。
使用 vi 等编辑器，将参数值设置为 yes，或者整个删除或注释（在最开头添加 # 号）整行配置。比如：# PasswordAuthentication no
使用如下指令重启 SSH 服务：service sshd restart
再次尝试登录服务器。解除必须使用密钥对进行登陆的限制。
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PermitRootLogin no 设置成yes