iptables當找到匹配的規則時，就會執行相應的動作，而不會向下繼續匹配。
因為ssh端口開放的規則在all規則之后，所以永遠都不會匹配到，也就是ssh永遠被禁止。
root下執行：
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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