首先确认华为云服务器ECS的安全组规则

入方向和出方向是否的设置（默认设置全部开放）

安全组规则

云服务器购买时设置的登陆账户为root（依据此账户登陆）

进入终端（terminal）

命令行输入：ssh root@[服务器弹性公网IP]
输入password
即可成功连接！

可能提示：

The authenticity of host '弹性公网IP (弹性公网IP)' can't be established.
ECDSA key fingerprint is XXXXXXXXXXXXXXXXXXXXX
Are you sure you want to continue connecting (yes/no)?
输入：yes
Warning: Permanently added '' 弹性公网IP(ECDSA) to the list of known hosts.
Connection closed by 弹性公网IP port 22

解决方式：
退出 重新连接：