Spring microservice instance is not registering with Eureka running in port other than 8761 - spring

Question

application.yml of my microservice (client to Eureka)
spring:
application:
name: queue1
eureka:
client:
registerWithEureka: true
fetchRegistry: true
serviceUrl:
defaultZone: http://localhost:8762/
server:
port: 7777
app:
id: ${random.uuid}
application.yml of Eureka
eureka:
instance:
hostname: peer1
client:
register-with-eureka: false
fetch-registry: false
server:
port: 8762
I am starting Eureka in port 8762 and referring to that in my microservices.
Microservice is failing to register itself with Eureka.
Following is the exception from microservice logs.
2019-03-21 17:02:16.248 ERROR 1804 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_ZUUL_RIBBON/ICB8061.ibsplc.com:zuul_ribbon:8080 - was unable to refresh its cache! status = Cannot execute request on any known server
com.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-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) ~[eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1051) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:965) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.DiscoveryClient.refreshRegistry(DiscoveryClient.java:1479) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.DiscoveryClient$CacheRefreshThread.run(DiscoveryClient.java:1446) [eureka-client-1.9.8.jar:1.9.8]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [na:1.8.0_202]
at java.util.concurrent.FutureTask.run(Unknown Source) [na:1.8.0_202]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_202]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_202]
at java.lang.Thread.run(Unknown Source) [na:1.8.0_202]
2019-03-21 17:02:16.278 ERROR 1804 --- [tbeatExecutor-0] c.n.d.s.t.d.RedirectingEurekaHttpClient : Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://localhost:8762/}
javax.ws.rs.WebApplicationException: com.fasterxml.jackson.databind.exc.MismatchedInputException: Root name 'timestamp' does not match expected ('instance') for type [simple type, class com.netflix.appinfo.InstanceInfo]
at [Source: (com.sun.jersey.client.apache4.ApacheHttpClient4Handler$HttpClientResponseInputStream); line: 1, column: 2]
at com.netflix.discovery.provider.DiscoveryJerseyProvider.readFrom(DiscoveryJerseyProvider.java:110) ~[eureka-client-1.9.8.jar:1.9.8]
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:634) ~[jersey-client-1.19.1.jar:1.19.1]
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:586) ~[jersey-client-1.19.1.jar:1.19.1]
at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.sendHeartBeat(AbstractJerseyEurekaHttpClient.java:105) ~[eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$3.execute(EurekaHttpClientDecorator.java:92) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73) ~[eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$3.execute(EurekaHttpClientDecorator.java:92) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:89) ~[eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$3.execute(EurekaHttpClientDecorator.java:92) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:120) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$3.execute(EurekaHttpClientDecorator.java:92) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.DiscoveryClient.renew(DiscoveryClient.java:846) [eureka-client-1.9.8.jar:1.9.8]
at com.netflix.discovery.DiscoveryClient$HeartbeatThread.run(DiscoveryClient.java:1405) [eureka-client-1.9.8.jar:1.9.8]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [na:1.8.0_202]
at java.util.concurrent.FutureTask.run(Unknown Source) [na:1.8.0_202]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_202]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_202]
at java.lang.Thread.run(Unknown Source) [na:1.8.0_202]
Now the most important thing is, everything is perfectly fine if I change the Eureka server port and the microservice's Eureka registration port to 8761 !!!! Registration of microservice is succeding in this case.
Did this multiple times before posting the question and it is behaving like this.
Any inputs here would be very much helpful.

Answer 1

I had the same issue, it was due to spring security dependencies in the Eureka server project. After adding the #EnableWebSecurity code to the eureka server application fixed for me.
#EnableWebSecurity
static class WebSecurityConfig extends WebSecurityConfigurerAdapter {
#Override
protected void configure(HttpSecurity http) throws Exception {
http.csrf().disable();
}
}
Spring Boot Verison - 2.3.2.RELEASE
Spring Cloud Version - Hoxton.SR1
https://github.com/spring-cloud/spring-cloud-netflix/issues/2754#issuecomment-372808529