iptables当找到匹配的规则时，就会执行相应的动作，而不会向下继续匹配。
因为ssh端口开放的规则在all规则之后，所以永远都不会匹配到，也就是ssh永远被禁止。
root下执行：
iptables -I INPUT -p tcp --dport 22 -j ACCEPT
即可。
Ubuntu error： ssh: connect to host master port 22: No route to host lost connection
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