遇到这个问题三天了，在网上搜索了很多文章都说把时间调大，不过对于我来说没有什么用处。今天在解决另一个问题顺便解决了这个问题，给以后遇到此问题的同学做一个参考。
解决办法：1.关闭Linux防火墙
2.或者让2181端口通过防火墙。命令：iptables -I INPUT -p tcp --dport 2181 -j ACCEPT
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Caused by: org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper server within timeout: 5000
org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper server within
Exception in thread "main" org.I0Itec.zkclient.exception.ZkAuthFailedException: Authentication failure is thrown while creating kafka topic
Unable to connect to zookeeper server within timeout: 5000
zookeeper超时：Unable to connect to zookeeper server within timeout: 5000
zookeeper_service 出错 java.lang.NoClassDefFoundError: org/I0Itec/zkclient/exception/ZkNoNodeException
zookeeper报错： org.I0Itec.zkclient.exception.ZkMarshallingError: java.io.EOFException
java.lang.ClassNotFoundException: org.I0Itec.zkclient.exception.ZkNoNodeException 异常 如何处理
在启动dubbo框架时报错。Unable to connect to zookeeper server within timeout: 5000
java.lang.ClassNotFoundException: org.I0Itec.zkclient.IZkStateListener异常解决