ssh_exchange_identification: Connection closed by remote host

ssh_exchange_identification: Connection closed by remote host

the connection to the remote host was lost . this usually means that you network connection went down or that the remote host was rebooted most network outages are short. and thus trying again may work

1)  最简单的解决方法就是让/etc/hosts.allow 和/etc/hosts.deny里面的所有信息都不生效,全部注销掉,重启SSH服务就可以了

2)但是还有一种情况，就是客户端连接数过多时，也会报这个错误。缺省情况下，SSH终端连接数最大为10个。在这种情况下，需要改SSH的配置文件，

grep MaxStartups /etc/ssh/sshd_config

grep MaxSession /etc/ssh/sshd_config

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