客户端注册eureka服务端时报错 com.netflix.discovery.shared.transport.TransportException: Cannot execute request

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
	at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:111) ~[eureka-client-1.6.2.jar:1.6.2]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.6.2.jar:1.6.2]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) ~[eureka-client-1.6.2.jar:1.6.2]
	at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.6.2.jar:1.6.2]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.6.2.jar:1.6.2]
	at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1013) [eureka-client-1.6.2.jar:1.6.2]
	at com.netflix.discovery.DiscoveryClient.getAndUpdateDelta(DiscoveryClient.java:1055) [eureka-client-1.6.2.jar:1.6.2]
	at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:929) [eureka-client-1.6.2.jar:1.6.2]
	at com.netflix.discovery.DiscoveryClient.refreshRegistry(DiscoveryClient.java:1451) [eureka-client-1.6.2.jar:1.6.2]
	at com.netflix.discovery.DiscoveryClient$CacheRefreshThread.run(DiscoveryClient.java:1418) [eureka-client-1.6.2.jar:1.6.2]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [na:1.7.0_80]
	at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_80]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_80]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_80]
	at java.lang.Thread.run(Thread.java:745) [na:1.7.0_80]

我的原因很愚蠢，在启动eureka时，出现上述错误，但一直无法解决，终于！！！！！

通过下面的方式解决了：

1、application.yml中下面内容应与你的eureka server端口保持一致

defaultZone: http://localhost:7001/eureka

2、不要忘了在启动类中加上

@EnableEurekaClient

3、一定要在启动eureka server后再启动客户端。