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

I am new to microservices and springboot, learning it. Got the following issue. Please check.

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.