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

Question

I am very new to the microservices and trying to run the code from link: https://dzone.com/articles/advanced-microservices-security-with-spring-and-oa . When I simply run th

Answer 1

If your eureka server is deployed/running without username and password use below properties.

spring.application.name=Hello-World
eureka.client.serviceUrl.defaultZone=http://eurekaserver:password@localhost:9100/eureka
server.port=9200
eureka.client.fetch-registry=true

If your eureka server is deployed/running with username and password use below properties.

spring.application.name=Hello-World
eureka.client.serviceUrl.defaultZone=http://eurekaserverusername:eurekaserverpassword@localhost:9100/eureka
server.port=9200
eureka.client.fetch-registry=true

Answer 2

I was facing the same error when my Eureka client i.e microservice trying to register herself with Eureka Server.

Client registration eureka service failure registration failed Cannot execute request on any known server

This error message comes because of following two possibilities.

1) The defaultZone address is incorrect , either its misspelled or the space is missing after :.

2) Spring security implemented on Eureka server require a valid CSRF token be sent with every request. Eureka clients will not generally possess a valid cross site request forgery (CSRF) token. So you will need to disable this requirement for the /eureka/** endpoints.

After disabling the CSRF token with follwoing line of code my Eureka client successfully register them selves with Eureka Server.

@EnableWebSecurity
class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().ignoringAntMatchers("/eureka/**");
        super.configure(http);
    }
}

Also below is the link from spring docs.

https://cloud.spring.io/spring-cloud-static/Greenwich.SR2/single/spring-cloud.html#_securing_the_eureka_server

Answer 3

This is happening because it is trying to connect to any known server, so to stop that error, a known server is eureka server on port 8761 which is its default port, you will have to update the application.properties with following

server.port=8761

To avoid eureka from registering itself, you add this to the application.properties

eureka.client.register-with-eureka=false

Ensure that EurekaServer is enabled, for example using spring boot you write the below on the main class.

@EnableEurekaServer

Please pardon me providing solution using .properties file but that is what i work with but .yml configurations shouldn't be too different.

Answer 4

Check your URL and port number of eureka server provided in "eureka.client.serviceUrl.defaultZone" property.