- [x] I have searched the
[issues](https://github.com/apache/incubator-dubbo/issues) of this repository
and believe that this is not a duplicate.
- [x] I have checked the
[FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this
repository and believe that this is not a duplicate.
### Environment
* Dubbo version: 2.7.0
* Operating System version: MacOS
* Java version: 11.0.1
### Steps to reproduce this issue
1. Run org.apache.dubbo.demo.provider.Provider
### Expected Result
Provider should start.
### Actual Result
```
Caused by: java.lang.IllegalStateException: Failed to connect to config center
(zookeeper): 127.0.0.1:2181 in 30000ms.
at
org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.initWith(ZookeeperDynamicConfiguration.java:79)
at
org.apache.dubbo.configcenter.AbstractDynamicConfiguration.<init>(AbstractDynamicConfiguration.java:46)
at
org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.<init>(ZookeeperDynamicConfiguration.java:62)
at
org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfigurationFactory.createDynamicConfiguration(ZookeeperDynamicConfigurationFactory.java:29)
at
org.apache.dubbo.configcenter.AbstractDynamicConfigurationFactory.getDynamicConfiguration(AbstractDynamicConfigurationFactory.java:33)
at
org.apache.dubbo.config.ConfigCenterConfig.startDynamicConfiguration(ConfigCenterConfig.java:105)
at
org.apache.dubbo.config.ConfigCenterConfig.init(ConfigCenterConfig.java:82)
at
org.apache.dubbo.config.spring.ConfigCenterBean.afterPropertiesSet(ConfigCenterBean.java:98)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1688)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1626)
... 12 more
```
People may not install zookeeper locally, we need to restore the behavior to
use multicast as default registry.
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/3071 ]
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