sh_exchange_identification: Connection closed by remote host

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sh_exchange_identification: Connection closed by remote host
多半是系统突然遭到暴力破解尝试。解决的办法是阻止暴力破解：

iptables -I INPUT -p tcp --dport 22 -j DROP

iptables -I INPUT -s 22.33.44.55 -p tcp --dport 22 -j ACCEPT

其中22.33.44.55换为本机的IP地址。