diff --git a/spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/discovery/ServicePortNameAndNumber.java b/spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/discovery/ServicePortNameAndNumber.java
index 7e88d98c..bf38f281 100644
--- a/spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/discovery/ServicePortNameAndNumber.java
+++ b/spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/discovery/ServicePortNameAndNumber.java
@@ -16,8 +16,10 @@
 
 package org.springframework.cloud.kubernetes.commons.discovery;
 
+import jakarta.annotation.Nullable;
+
 /**
  * @author wind57
  */
-public record ServicePortNameAndNumber(int portNumber, String portName) {
+public record ServicePortNameAndNumber(@Nullable Integer portNumber, @Nullable String portName) {
 }
diff --git a/spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/discovery/ServicePortSecureResolver.java b/spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/discovery/ServicePortSecureResolver.java
index 035d0026..bf49e18c 100644
--- a/spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/discovery/ServicePortSecureResolver.java
+++ b/spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/discovery/ServicePortSecureResolver.java
@@ -54,6 +54,8 @@ public final class ServicePortSecureResolver {
 		String serviceName = input.serviceName();
 		ServicePortNameAndNumber portData = input.portData();
 
+		Integer portNumber = portData.portNumber();
+
 		Optional<String> securedLabelValue = Optional.ofNullable(input.serviceLabels().get(SECURED));
 		if (securedLabelValue.isPresent() && TRUTHY_STRINGS.contains(securedLabelValue.get())) {
 			logEntry(serviceName, portData.portNumber(), "the service contains a true value for the 'secured' label");
@@ -67,7 +69,7 @@ public final class ServicePortSecureResolver {
 			return true;
 		}
 
-		if (properties.knownSecurePorts().contains(portData.portNumber())) {
+		if (portNumber != null && properties.knownSecurePorts().contains(portData.portNumber())) {
 			logEntry(serviceName, portData.portNumber(), "port is known to be a https port");
 			return true;
 		}
diff --git a/spring-cloud-kubernetes-fabric8-loadbalancer/src/main/java/org/springframework/cloud/kubernetes/fabric8/loadbalancer/Fabric8ServiceInstanceMapper.java b/spring-cloud-kubernetes-fabric8-loadbalancer/src/main/java/org/springframework/cloud/kubernetes/fabric8/loadbalancer/Fabric8ServiceInstanceMapper.java
index 521c1178..99de7559 100644
--- a/spring-cloud-kubernetes-fabric8-loadbalancer/src/main/java/org/springframework/cloud/kubernetes/fabric8/loadbalancer/Fabric8ServiceInstanceMapper.java
+++ b/spring-cloud-kubernetes-fabric8-loadbalancer/src/main/java/org/springframework/cloud/kubernetes/fabric8/loadbalancer/Fabric8ServiceInstanceMapper.java
@@ -30,10 +30,14 @@ import org.springframework.cloud.kubernetes.commons.discovery.DiscoveryClientUti
 import org.springframework.cloud.kubernetes.commons.discovery.KubernetesDiscoveryProperties;
 import org.springframework.cloud.kubernetes.commons.discovery.KubernetesServiceInstance;
 import org.springframework.cloud.kubernetes.commons.discovery.ServiceMetadata;
+import org.springframework.cloud.kubernetes.commons.discovery.ServicePortNameAndNumber;
+import org.springframework.cloud.kubernetes.commons.discovery.ServicePortSecureResolver;
 import org.springframework.cloud.kubernetes.commons.loadbalancer.KubernetesLoadBalancerProperties;
 import org.springframework.cloud.kubernetes.commons.loadbalancer.KubernetesServiceInstanceMapper;
 import org.springframework.cloud.kubernetes.fabric8.Fabric8Utils;
 
+import static org.springframework.cloud.kubernetes.commons.discovery.ServicePortSecureResolver.Input;
+
 /**
  * Class for mapping Kubernetes Service object into {@link KubernetesServiceInstance}.
  *
@@ -50,10 +54,13 @@ public class Fabric8ServiceInstanceMapper implements KubernetesServiceInstanceMa
 
 	private final KubernetesDiscoveryProperties discoveryProperties;
 
+	private final ServicePortSecureResolver resolver;
+
 	Fabric8ServiceInstanceMapper(KubernetesLoadBalancerProperties properties,
 			KubernetesDiscoveryProperties discoveryProperties) {
 		this.properties = properties;
 		this.discoveryProperties = discoveryProperties;
+		resolver = new ServicePortSecureResolver(discoveryProperties);
 	}
 
 	@Override
@@ -76,8 +83,9 @@ public class Fabric8ServiceInstanceMapper implements KubernetesServiceInstanceMa
 		}
 		String host = KubernetesServiceInstanceMapper.createHost(service.getMetadata().getName(),
 				service.getMetadata().getNamespace(), properties.getClusterDomain());
-		boolean secure = KubernetesServiceInstanceMapper.isSecure(service.getMetadata().getLabels(),
-				service.getMetadata().getAnnotations(), port.getName(), port.getPort());
+
+		boolean secure = secure(port, service);
+
 		return new DefaultKubernetesServiceInstance(meta.getUid(), meta.getName(), host, port.getPort(),
 				serviceMetadata(service), secure);
 	}
@@ -87,4 +95,11 @@ public class Fabric8ServiceInstanceMapper implements KubernetesServiceInstanceMa
 		return DiscoveryClientUtils.serviceInstanceMetadata(PORTS_DATA, serviceMetadata, discoveryProperties);
 	}
 
+	boolean secure(ServicePort port, Service service) {
+		ObjectMeta metadata = service.getMetadata();
+		ServicePortNameAndNumber portNameAndNumber = new ServicePortNameAndNumber(port.getPort(), port.getName());
+		Input input = new Input(portNameAndNumber, metadata.getName(), metadata.getLabels(), metadata.getAnnotations());
+		return resolver.resolve(input);
+	}
+
 }
diff --git a/spring-cloud-kubernetes-fabric8-loadbalancer/src/test/java/org/springframework/cloud/kubernetes/fabric8/loadbalancer/Fabric8ServiceInstanceMapperTests.java b/spring-cloud-kubernetes-fabric8-loadbalancer/src/test/java/org/springframework/cloud/kubernetes/fabric8/loadbalancer/Fabric8ServiceInstanceMapperTests.java
index a4a37c3f..06015a01 100644
--- a/spring-cloud-kubernetes-fabric8-loadbalancer/src/test/java/org/springframework/cloud/kubernetes/fabric8/loadbalancer/Fabric8ServiceInstanceMapperTests.java
+++ b/spring-cloud-kubernetes-fabric8-loadbalancer/src/test/java/org/springframework/cloud/kubernetes/fabric8/loadbalancer/Fabric8ServiceInstanceMapperTests.java
@@ -66,8 +66,13 @@ class Fabric8ServiceInstanceMapperTests {
 	void testMapperSecure() {
 		KubernetesLoadBalancerProperties properties = new KubernetesLoadBalancerProperties();
 		Service service = buildService("test", "test-namespace", "abc", 443, null, Map.of());
-		KubernetesServiceInstance instance = new Fabric8ServiceInstanceMapper(properties,
-				KubernetesDiscoveryProperties.DEFAULT).map(service);
+
+		KubernetesDiscoveryProperties discoveryProperties = new KubernetesDiscoveryProperties(true, false, Set.of(),
+				true, 60, false, null, Set.of(443, 8443), Map.of(), null,
+				KubernetesDiscoveryProperties.Metadata.DEFAULT, 0, false, false, null);
+
+		KubernetesServiceInstance instance = new Fabric8ServiceInstanceMapper(properties, discoveryProperties)
+				.map(service);
 		Assertions.assertNotNull(instance);
 		Assertions.assertEquals("test", instance.getServiceId());
 		Assertions.assertEquals("abc", instance.getInstanceId());
@@ -78,8 +83,8 @@ class Fabric8ServiceInstanceMapperTests {
 	void testMapperSecureNullLabelsAndAnnotations() {
 		KubernetesLoadBalancerProperties properties = new KubernetesLoadBalancerProperties();
 		KubernetesDiscoveryProperties discoveryProperties = new KubernetesDiscoveryProperties(true, true, Set.of(),
-				true, 60, false, null, Set.of(), Map.of(), null, KubernetesDiscoveryProperties.Metadata.DEFAULT, 0,
-				false);
+				true, 60, false, null, Set.of(443, 8443), Map.of(), null,
+				KubernetesDiscoveryProperties.Metadata.DEFAULT, 0, false);
 		List<ServicePort> ports = new ArrayList<>();
 		ports.add(new ServicePortBuilder().withPort(443).build());
 		Service service = buildService("test", "test-namespace", "abc", ports, null, null);