Redis deployed in AWS – Connection time out from localhost SpringBoot app

Small question regarding Redis deployed in AWS (not AWS Elastic Cache) and an issue connecting to it.

Here is the setup of the Redis deployed in AWS: (pasting only the Kubernetes StatefulSet and Service)

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis
spec:
  serviceName: redis
  replicas: 3
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      labels:
        app: redis
    spec:
      initContainers:
        - name: config
          image: redis:7.0.5-alpine
          command: [ "sh", "-c" ]
          args:
            - |
              cp /tmp/redis/redis.conf /etc/redis/redis.conf
              
              echo "finding master..."
              MASTER_FDQN=`hostname  -f | sed -e 's/redis-[0-9]./redis-0./'`
              if [ "$(redis-cli -h sentinel -p 5000 ping)" != "PONG" ]; then
                echo "master not found, defaulting to redis-0"
              
                if [ "$(hostname)" = "redis-0" ]; then
                  echo "this is redis-0, not updating config..."
                else
                  echo "updating redis.conf..."
                  echo "slaveof $MASTER_FDQN 6379" >> /etc/redis/redis.conf
                fi
              else
                echo "sentinel found, finding master"
                MASTER="$(redis-cli -h sentinel -p 5000 sentinel get-master-addr-by-name mymaster | grep -E '(^redis-d{1,})|([0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3})')"
                echo "master found : $MASTER, updating redis.conf"
                echo "slaveof $MASTER 6379" >> /etc/redis/redis.conf
              fi
          volumeMounts:
            - name: redis-config
              mountPath: /etc/redis/
            - name: config
              mountPath: /tmp/redis/
      containers:
        - name: redis
          image: redis:7.0.5-alpine
          command: ["redis-server"]
          args: ["/etc/redis/redis.conf"]
          ports:
            - containerPort: 6379
              name: redis
          volumeMounts:
            - name: data
              mountPath: /data
            - name: redis-config
              mountPath: /etc/redis/
      volumes:
        - name: redis-config
          emptyDir: {}
        - name: config
          configMap:
            name: redis-config
  volumeClaimTemplates:
    - metadata:
        name: data
      spec:
        accessModes: [ "ReadWriteOnce" ]
        storageClassName: nfs-1
        resources:
          requests:
            storage: 50Mi
---
apiVersion: v1
kind: Service
metadata:
  name: redis
spec:
  ports:
    - port: 6379
      targetPort: 6379
      name: redis
  selector:
    app: redis
  type: LoadBalancer

The pods are healthy, I can exec into it and perform operations fine. Here is the get all:

NAME          READY   STATUS    RESTARTS   AGE
pod/redis-0   1/1     Running   0          22h
pod/redis-1   1/1     Running   0          22h
pod/redis-2   1/1     Running   0          22h

NAME            TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
service/redis   LoadBalancer   192.168.45.55   10.51.5.2     6379:30315/TCP   26h

NAME                     READY   AGE
statefulset.apps/redis   3/3     22h

Here is the describe of the service:

Name:                     redis
Namespace:                Namespace
Labels:                   <none>
Annotations:              <none>
Selector:                 app=redis
Type:                     LoadBalancer
IP Family Policy:         SingleStack
IP Families:              IPv4
IP:                       192.168.22.33
IPs:                      192.168.22.33
LoadBalancer Ingress:     10.51.5.2
Port:                     redis  6379/TCP
TargetPort:               6379/TCP
NodePort:                 redis  30315/TCP
Endpoints:                192.xxx:6379,192.xxx:6379,192.xxx:6379
Session Affinity:         None
External Traffic Policy:  Cluster
Events:
  Type    Reason        Age                From                Message
  ----    ------        ----               ----                -------
  Normal  IPAllocated   68s                metallb-controller  Assigned IP ["10.51.5.2"]
  Normal  nodeAssigned  58s (x5 over 66s)  metallb-speaker     announcing from node "someaddress.com" with protocol "bgp"
  Normal  nodeAssigned  58s (x5 over 66s)  metallb-speaker     announcing from node "someaddress.com" with protocol "bgp"

I then try to connect to it, i.e. inserting some data with a very straightforward Spring Boot application. The application has no business logic, just trying to insert data.
Here are the relevant parts:

@Configuration
public class RedisConfiguration {

    @Bean
    public ReactiveRedisConnectionFactory reactiveRedisConnectionFactory() {
        return new LettuceConnectionFactory("10.51.5.2", 30315);
    }

@Repository
public class RedisRepository {

    private final ReactiveRedisOperations<String, String> reactiveRedisOperations;

    public RedisRepository(ReactiveRedisOperations<String, String> reactiveRedisOperations) {
        this.reactiveRedisOperations = reactiveRedisOperations;
    }

    public Mono<RedisPojo> save(RedisPojo redisPojo) {
        return reactiveRedisOperations.opsForValue().set(redisPojo.getInput(), redisPojo.getOutput()).map(__ -> redisPojo);
    }

Each time I am trying to write the data, I am getting this exception:

2022-12-02T20:20:08.015+08:00 ERROR 1184 --- [ctor-http-nio-3] a.w.r.e.AbstractErrorWebExceptionHandler : [8f16a752-1]  500 Server Error for HTTP POST "/save"

org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis
    at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.translateException(LettuceConnectionFactory.java:1602) ~[spring-data-redis-3.0.0.jar:3.0.0]
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
    *__checkpoint ⇢ Handler com.redis.controller.RedisController#test(RedisRequest) [DispatcherHandler]
    *__checkpoint ⇢ HTTP POST "/save" [ExceptionHandlingWebHandler]
Original Stack Trace:
        at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.translateException(LettuceConnectionFactory.java:1602) ~[spring-data-redis-3.0.0.jar:3.0.0]

Caused by: io.lettuce.core.RedisConnectionException: Unable to connect to 10.51.5.2/<unresolved>:30315
    at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:78) ~[lettuce-core-6.2.1.RELEASE.jar:6.2.1.RELEASE]
    at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:56) ~[lettuce-core-6.2.1.RELEASE.jar:6.2.1.RELEASE]
    at io.lettuce.core.AbstractRedisClient.getConnection(AbstractRedisClient.java:350) ~[lettuce-core-6.2.1.RELEASE.jar:6.2.1.RELEASE]
    at io.lettuce.core.RedisClient.connect(RedisClient.java:216) ~[lettuce-core-6.2.1.RELEASE.jar:6.2.1.RELEASE]

Caused by: io.netty.channel.ConnectTimeoutException: connection timed out: /10.51.5.2:30315
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:261) ~[netty-transport-4.1.85.Final.jar:4.1.85.Final]
    at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98) ~[netty-common-4.1.85.Final.jar:4.1.85.Final]

This is particularly puzzling, because I am quite sure the code of the Spring Boot app is working. When I change the IP of return new LettuceConnectionFactory("10.51.5.2", 30315);: to

1. a regular Redis on my laptop ("localhost", 6379),
2. a dockerized Redis on my laptop,
3. a dockerized Redis on prem, all are working fine.

Therefore, I am quite puzzled what did I do wrong with the setup of this Redis in AWS.
What should I do in order to connect to it properly.
May I get some help please?

Thank you