java.net.ConnectException: Connection timed out: no further information
今天使用dubbo的时候 出现了这个错误，服务不能注册，排查缘由是linux的防火墙没有开放2181端口，因此咱们能够选择把防火墙关闭，关闭命令为`linux [root@tengfei ~]# service iptables stop
iptables：将链设置为政策 ACCEPT：filter [肯定]
iptables：清除防火墙规则：
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