解決辦法
(1)查看這兩個文件是否有阻止
cat /etc/hosts.deny cat /etc/hosts.allow
（2）客戶端連接數過多
修改/etc/ssh/sshd_config中#MaxStartups 10，將其改為MaxStartups 100
重啟
ssh 連接不上報Connection closed by remote host
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