dubbo-provider启动报错：Unable to connect to zookeeper server within timeout: 5000

确认网络访问正常，确认dubbo配置是官方提供的示例配置情况下报错如下：

2017-08-30 21:03:12,774 [main-EventThread] [org.apache.zookeeper.ClientCnxn]-[INFO] EventThread shut down

org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper server within timeout: 5000
at org.I0Itec.zkclient.ZkClient.connect(ZkClient.java:876)
at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:98)
at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:92)
at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:80)
at com.alibaba.dubbo.remoting.zookeeper.zkclient.ZkclientZookeeperClient.<init>(ZkclientZookeeperClient.java:29)
at com.alibaba.dubbo.remoting.zookeeper.zkclient.ZkclientZookeeperTransporter.connect(ZkclientZookeeperTransporter.java:10)
at com.alibaba.dubbo.remoting.zookeeper.ZookeeperTransporter$Adpative.connect(ZookeeperTransporter$Adpative.java)
at com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry.<init>(ZookeeperRegistry.java:69)
at com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistryFactory.createRegistry(ZookeeperRegistryFactory.java:37)
at com.alibaba.dubbo.registry.support.AbstractRegistryFactory.getRegistry(AbstractRegistryFactory.java:94)
at com.alibaba.dubbo.registry.RegistryFactory$Adpative.getRegistry(RegistryFactory$Adpative.java)
at com.alibaba.dubbo.registry.integration.RegistryProtocol.getRegistry(RegistryProtocol.java:190)
at com.alibaba.dubbo.registry.integration.RegistryProtocol.export(RegistryProtocol.java:109)
at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:53)
at com.alibaba.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:54)
at com.alibaba.dubbo.rpc.Protocol$Adpative.export(Protocol$Adpative.java)
at com.alibaba.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:489)
at com.alibaba.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:285)
at com.alibaba.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:246)
at com.alibaba.dubbo.config.ServiceConfig.export(ServiceConfig.java:145)
at com.alibaba.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:110)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:393)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:883)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:93)
at cn.sanishan.ss.dubbo.demo.Provider.main(Provider.java:7)

配置详情：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> 
<!-- 提供方应用信息，用于计算依赖关系 -->
<dubbo:application name="ss-order-rpc-service" />
<!-- 使用multicast广播注册中心暴露服务地址 -->
<dubbo:registry address="zookeeper://192.168.206.132:2181?backup=192.168.206.138:2181,192.168.206.139:2181" />
<!-- 用dubbo协议在20880端口暴露服务 -->
<dubbo:protocol name="dubbo" port="20880" />

<!-- 声明需要暴露的服务接口 -->
<dubbo:service interface="cn.sanishan.ss.dubbo.demo.DemoService" ref="demoService" />

<!-- 和本地bean一样实现服务 -->
<bean id="demoService" class="cn.sanishan.ss.dubbo.demo.provider.DemoServiceImpl" />
</beans>

度娘搜到一些博友说是zookeeper的jar包版本与服务器部署的版本不一致的问题，在我实际测试中发现并不是此问题导致的，而是通过修改配置，添加连接zookeeper注册中心超时时间timeout="100000"

<dubbo:registry address="zookeeper://192.168.206.132:2181?backup=192.168.206.138:2181,192.168.206.139:2181"  timeout="100000"/>