Cannot execute request on any known server
1、com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect
或者com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
原因如下：
在默認設置下，Eureka服務註冊中心也會將自己作為客戶端來嘗試註冊它自己，所以我們需要禁用它的客戶端註冊行為。
禁止方式如下：在application.properties配置文件中增加以下內容
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
如圖所示：
重新啟動即可Cannot execute request on any known server
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