启动服务A报错

com.ecwid.consul.transport.TransportException: org.apache.http.conn.HttpHostConnectException: Connect to localhost:8500 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect
at com.ecwid.consul.transport.AbstractHttpTransport.executeRequest(AbstractHttpTransport.java:77) ~[consul-api-1.4.1.jar:na]
at com.ecwid.consul.transport.AbstractHttpTransport.makePutRequest(AbstractHttpTransport.java:41) ~[consul-api-1.4.1.jar:na]
at com.ecwid.consul.v1.ConsulRawClient.makePutRequest(ConsulRawClient.java:135) ~[consul-api-1.4.1.jar:na]
at com.ecwid.consul.v1.agent.AgentConsulClient.agentServiceRegister(AgentConsulClient.java:273) ~[consul-api-1.4.1.jar:na]
at com.ecwid.consul.v1.ConsulClient.agentServiceRegister(ConsulClient.java:309) ~[consul-api-1.4.1.jar:na]
at org.springframework.cloud.consul.serviceregistry.ConsulServiceRegistry.register(ConsulServiceRegistry.java:64) [spring-cloud-consul-discovery-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.cloud.consul.serviceregistry.ConsulServiceRegistry.register(ConsulServiceRegistry.java:41) [spring-cloud-consul-discovery-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.register(AbstractAutoServiceRegistration.java:219) [spring-cloud-commons-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.cloud.consul.serviceregistry.ConsulAutoServiceRegistration.register(ConsulAutoServiceRegistration.java:78) [spring-cloud-consul-discovery-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.start(AbstractAutoServiceRegistration.java:118) [spring-cloud-commons-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.cloud.consul.serviceregistry.ConsulAutoServiceRegistration.start(ConsulAutoServiceRegistration.java:68) [spring-cloud-consul-discovery-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.cloud.consul.serviceregistry.ConsulAutoServiceRegistrationListener.onApplicationEvent(ConsulAutoServiceRegistrationListener.java:39) [spring-cloud-consul-discovery-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) [spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) [spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) [spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:398) [spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:355) [spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:166) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) [spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.txlcn.demo.servicec.SpringServiceCApplication.main(SpringServiceCApplication.java:20) [classes/:na]
Caused by: org.apache.http.conn.HttpHostConnectException: Connect to localhost:8500 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:159) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:394) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:72) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:221) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:165) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:140) ~[httpclient-4.5.6.jar:4.5.6]
at com.ecwid.consul.transport.AbstractHttpTransport.executeRequest(AbstractHttpTransport.java:61) ~[consul-api-1.4.1.jar:na]
... 25 common frames omitted
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_05]
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_05]
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345) ~[na:1.8.0_05]
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_05]
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_05]
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_05]
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_05]
at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_05]
at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75) ~[httpclient-4.5.6.jar:4.5.6]
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142) ~[httpclient-4.5.6.jar:4.5.6]
... 37 common frames omitted

Start at org.txlcn.demo.servicec.SpringServiceCApplication and trace the Spring Cloud Consul registration shown in the stack trace. Check why the application cannot connect to Consul at localhost:8500; done means the service starts without the connection-refused error and registration succeeds.

Written by the indexing model from the issue text.