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在搭建SpringCloud(Finchley.SR2) Eureka 服务端和客户端环境时，在添加了验证功能，SpringSecurity,客户端在注册到服务端时候，会出现下面的异常

com.netflix.discovery.DiscoveryClient    : DiscoveryClient_PROVIDER/10.100.20.50:provider:9711 - registration failed Cannot execute request on any known servercom.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server	at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112) ~[eureka-client-1.9.3.jar:1.9.3]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.3.jar:1.9.3]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.9.3.jar:1.9.3]	at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.3.jar:1.9.3]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.3.jar:1.9.3]	at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) ~[eureka-client-1.9.3.jar:1.9.3]	at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.9.3.jar:1.9.3]	at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) [eureka-client-1.9.3.jar:1.9.3]	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_161]	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) [na:1.8.0_161]	at java.util.concurrent.FutureTask.run(FutureTask.java) [na:1.8.0_161]	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_161]	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_161]	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_161]	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_161]	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161]

服务端配置文件

spring:  application:    name: eureka-server  security:    user:      name: root      password: root

客户端配置

server:  port: 9711eureka:  instance:    # 指定当profile=provider1时，主机名是provider9711    hostname: provider9711    prefer-ip-address: true  client:    serviceUrl:      # 将自己注册到eureka1,2Eureka上面去,      defaultZone:  http://root:root@eureka1:9701/eureka/

原因是SpringCloud(Finchley.SR2)以上版本默认开启的csrf验证，

解决方案是重写配置文件

@EnableWebSecuritypublic class WebSecurityConfig extends WebSecurityConfigurerAdapter {    @Override    protected void configure(HttpSecurity http) throws Exception {        http.csrf().disable();        super.configure(http);    }}

还有一种情况Eureka 服务端也会出现

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server

eureka.client.register-with-eureka=trueeureka.client.fetch-registry=true

只需将上面的配置改成false

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