Have you started name server? It looks name server is not listening.
> 在 2018年6月7日，上午10:19，Kasthuriraajan Ratnasingam <[email protected]>
> 写道：
>
> Hi all,
>
> I am using rocketmq in ubuntu 16.04. I am following the guidelines from
> http://rocketmq.apache.org/docs/quick-start/
> <http://rocketmq.apache.org/docs/quick-start/> .
>
> When I try to start the broker I have got the following error.
>
> 2018-04-05 09:56:29 WARN ShutdownHook - unregisterBroker Exception,
> localhost:9876
> org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to
> <localhost:9876> failed
> at
> org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:388)
> ~[rocketmq-remoting-4.2.0.jar:4.2.0]
> at
> org.apache.rocketmq.broker.out.BrokerOuterAPI.unregisterBroker(BrokerOuterAPI.java:221)
> ~[rocketmq-broker-4.2.0.jar:4.2.0]
> at
> org.apache.rocketmq.broker.out.BrokerOuterAPI.unregisterBrokerAll(BrokerOuterAPI.java:198)
> ~[rocketmq-broker-4.2.0.jar:4.2.0]
> at
> org.apache.rocketmq.broker.BrokerController.unregisterBrokerAll(BrokerController.java:641)
> [rocketmq-broker-4.2.0.jar:4.2.0]
> at
> org.apache.rocketmq.broker.BrokerController.shutdown(BrokerController.java:607)
> [rocketmq-broker-4.2.0.jar:4.2.0]
> at
> org.apache.rocketmq.broker.BrokerStartup$1.run(BrokerStartup.java:227)
> [rocketmq-broker-4.2.0.jar:4.2.0]
> at java.lang.Thread.run(Thread.java:748) [na:1.8.0_151]
> 2018-04-05 09:56:29 INFO ShutdownHook - Shutdown hook over, consuming total
> time(ms): 6471
>
>
> Could you please help me to solve this problem? Thanks in advance.
>
> Best regards,
> R.Kasthuriraajan
>
> --
> R.Kasthuriraajan.
> Undergraduate student | Department of Computer Science,
> Faculty of Science | University of Jaffna.
>
> LinkedIn: https://www.linkedin.com/in/ratnasingam-kasthuriraajan-2a6892121/
> <https://www.linkedin.com/in/ratnasingam-kasthuriraajan-2a6892121/>
> stackoverflow:
> https://stackoverflow.com/users/8870269/kasthuriraajan?tab=profile
> <https://stackoverflow.com/users/8870269/kasthuriraajan?tab=profile>
> GitHub: https://github.com/kasthuriraajan <https://github.com/kasthuriraajan>
> Medium: https://medium.com/@Kasthuriraajan
> <https://medium.com/@Kasthuriraajan>
>
