A protocol error occurred. Change of username or service not allowed: (root,ssh-connection) -> (zoujiaqing,ssh-connection)
SecureCRT ssh 客户端连接失败：
The server has disconnected with an error. Server message reads: A protocol error occurred. Change of username or service not allowed: (root,ssh-connection) -> (zoujiaqing,ssh-connection) 这是因为SecureCRT设置中的用户名和你登录时候输入的用户名不相符，在这里改一下就可以：
选项 -> 会话选项 -> 连接 -> SSH2 -> 用户名
修改后登录正常，这样可以禁用服务器的ROOT登录了（为了安全）。
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