### Environment
* Dubbo version: 2.6.2
* Operating System version: CentOS7
* Java version: 1.8
### Steps to reproduce this issue
1. <dubbo:protocol name="rmi" port="20879" host="192.168.51.113" /> Select rmi
protocol
2. The service provider is on the 192.168.51.113 machine
Service consumers on other machines sun as 192.168.52.119
3. Service consumer reports exception, cannot find service exception is
"java.rmi.ConnectException: Connection refused to host: localhost; nested
exception is:"
But I did not configure localhost at all.
Pls. provide [GitHub address] to reproduce this issue.
### Expected Result
The service consumer can get the address of the service provider correctly
### Actual Result
Service consumer reports exception, cannot find service exception is
"java.rmi.ConnectException: Connection refused to host: localhost; nested
exception is:"
But I did not configure localhost at all.
If there is an exception, please attach the exception trace:
```
Caused by: com.alibaba.dubbo.rpc.RpcException: Failed to invoke the method
getEquipInitListByCollectPointKey in the service
com.agioe.atm.domain.monitoring.alarm.service.GlobalDevCacheService. Tried 1
times of the providers [192.168.51.113:20879] (1/1) from the registry
192.168.51.113:2181 on the consumer 192.168.52.119 using the dubbo version
2.6.2. Last error is: Failed to invoke remote service: interface
com.agioe.atm.domain.monitoring.alarm.service.GlobalDevCacheService, method:
getEquipInitListByCollectPointKey, cause: Could not connect to remote service
[rmi://192.168.51.113:20879/com.agioe.atm.domain.monitoring.alarm.service.GlobalDevCacheService];
nested exception is java.rmi.ConnectException: Connection refused to host:
localhost; nested exception is:
java.net.ConnectException: Connection refused: connect
at
com.alibaba.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:102)
at
com.alibaba.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:238)
at
com.alibaba.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:75)
at
com.alibaba.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:52)
at
com.alibaba.dubbo.common.bytecode.proxy6.getEquipInitListByCollectPointKey(proxy6.java)
at
com.agioe.atm.alarmlinkage.engine.support.AlarmLinkageJmsListener.alarm(AlarmLinkageJmsListener.java:68)
at
com.agioe.atm.alarmlinkage.engine.support.AlarmLinkageJmsListener.lambda$recvRealtimeData$1(AlarmLinkageJmsListener.java:58)
at
java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at
java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.ForEachOps$ForEachTask.compute(ForEachOps.java:291)
at java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:731)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinTask.doInvoke(ForkJoinTask.java:401)
at java.util.concurrent.ForkJoinTask.invoke(ForkJoinTask.java:734)
at
java.util.stream.ForEachOps$ForEachOp.evaluateParallel(ForEachOps.java:160)
at
java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateParallel(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:233)
at
java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at
java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:583)
at
com.agioe.atm.alarmlinkage.engine.support.AlarmLinkageJmsListener.recvRealtimeData(AlarmLinkageJmsListener.java:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.springframework.messaging.handler.invocation.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:180)
at
org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:112)
at
org.springframework.jms.listener.adapter.MessagingMessageListenerAdapter.invokeHandler(MessagingMessageListenerAdapter.java:104)
... 10 common frames omitted
Caused by: org.springframework.remoting.RemoteConnectFailureException: Could
not connect to remote service
[rmi://192.168.51.113:20879/com.agioe.atm.domain.monitoring.alarm.service.GlobalDevCacheService];
nested exception is java.rmi.ConnectException: Connection refused to host:
localhost; nested exception is:
```
### A piece of my mind
This seems to be a problem with the rmi protocol itself
My solution is:
System.setProperty("java.rmi.server.hostname", "192.168.51.113");
Now that dubbo has used zookeeper as a registry,can't you optimize this rmi
protocol Naming.lookup ?
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/2765 ]
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