Eureka client 无法启动 Connection refused_eureka报错拒绝连接

背景

Eureka Server正常启动后关闭服务，配置client，然后启动client的xxxApplication，出现报错：

INFO 44568 --- [  restartedMain] 
c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution error. endpoint=
DefaultEndpoint{ serviceUrl='http://localhost:8761/eureka/}, exception=I/O error on GET request for "http://localhost:8761/eureka/apps/": 
Connect to http://localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused stacktrace=org.springframework.web.client.ResourceAccessException: 
I/O error on GET request for "http://localhost:8761/eureka/apps/": 
Connect to http://localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: 
Connection refused
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试了网上很多办法，没有用处

解决办法

最后走投无路启动了server，突然发现server在控制台说有一个很久之前的请求，发现原来要启动client，必须在server正在启动的状态下再启动。。。