franknew opened a new issue #1082: agent connect to a remote collector, report failed URL: https://github.com/apache/incubator-skywalking/issues/1082 here is logs collector is in another centos 7 machine. port 11800 is AVAILABLE. collector config file: naming: jetty: host: 0.0.0.0 port: 10800 context_path: / remote: gRPC: host: 0.0.0.0 port: 11800 agent_gRPC: gRPC: host: 0.0.0.0 port: 11800 agent_jetty: jetty: host: 0.0.0.0 port: 12800 context_path: / analysis_register: default: analysis_jvm: default: analysis_segment_parser: default: buffer_file_path: ../buffer/ buffer_offset_max_file_size: 10M buffer_segment_max_file_size: 500M ui: jetty: host: 0.0.0.0 port: 12800 context_path: / storage: elasticsearch: cluster_name: elasticsearch cluster_transport_sniffer: true cluster_nodes: 127.0.0.1:9300 index_shards_number: 2 index_replicas_number: 0 ttl: 7 DEBUG 2018-04-16 16:51:50 AppAndServiceRegisterClient : AppAndServiceRegisterClient running, status:CONNECTED. ERROR 2018-04-16 16:51:50 AppAndServiceRegisterClient : AppAndServiceRegisterClient execute fail. org.apache.skywalking.apm.dependencies.io.grpc.StatusRuntimeException: UNAVAILABLE at org.apache.skywalking.apm.dependencies.io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:221) at org.apache.skywalking.apm.dependencies.io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:202) at org.apache.skywalking.apm.dependencies.io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:131) at org.apache.skywalking.apm.network.proto.ApplicationRegisterServiceGrpc$ApplicationRegisterServiceBlockingStub.applicationCodeRegister(ApplicationRegisterServiceGrpc.java:170) at org.apache.skywalking.apm.agent.core.remote.AppAndServiceRegisterClient.run(AppAndServiceRegisterClient.java:117) at org.apache.skywalking.apm.util.RunnableWithExceptionProtection.run(RunnableWithExceptionProtection.java:36) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: org.apache.skywalking.apm.dependencies.io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information: 0.0.0.0/0.0.0.0:11800 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) at org.apache.skywalking.apm.dependencies.io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:323) at org.apache.skywalking.apm.dependencies.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340) at org.apache.skywalking.apm.dependencies.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633) at org.apache.skywalking.apm.dependencies.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580) at org.apache.skywalking.apm.dependencies.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497) at org.apache.skywalking.apm.dependencies.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459) at org.apache.skywalking.apm.dependencies.io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) at org.apache.skywalking.apm.dependencies.io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138) ... 1 more Caused by: java.net.ConnectException: Connection refused: no further information ... 11 more
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