Change:
framework.Logf("Collection of services has been deleted") }) <ins> ginkgo.It("should serve endpoints on same port and different protocols", func(ctx context.Context) { serviceName := "multiprotocol-test" testLabels := map[string]string{"app": "multiport"} ns := f.Namespace.Name containerPort := 80 svcTCPport := v1.ServicePort{ Name:       "tcp-port", Port:       80, TargetPort: intstr.FromInt(containerPort), Protocol:   v1.ProtocolTCP, } svcUDPport := v1.ServicePort{ Name:       "udp-port", Port:       80, TargetPort: intstr.FromInt(containerPort), Protocol:   v1.ProtocolUDP, } ginkgo.By("creating service " + serviceName + " in namespace " + ns) testService := v1.Service{ ObjectMeta: metav1.ObjectMeta{ Name:   serviceName, Labels: testLabels, }, Spec: v1.ServiceSpec{ Type:     v1.ServiceTypeClusterIP, Selector: testLabels, Ports:    []v1.ServicePort{svcTCPport, svcUDPport}, }, } service, err := cs.CoreV1().Services(ns).Create(ctx, &testService, metav1.CreateOptions{}) framework.ExpectNoError(err, "failed to create Service") containerPorts := []v1.ContainerPort{{ Name:          svcTCPport.Name, ContainerPort: int32(containerPort), Protocol:      v1.ProtocolTCP, }, { Name:          svcUDPport.Name, ContainerPort: int32(containerPort), Protocol:      v1.ProtocolUDP, }} podname1 := "pod1" ginkgo.By("creating pod " + podname1 + " in namespace " + ns) createPodOrFail(ctx, f, ns, podname1, testLabels, containerPorts, "netexec", "--http-port", strconv.Itoa(containerPort), "--udp-port", strconv.Itoa(containerPort)) validateEndpointsPortsWithProtocolsOrFail(cs, ns, serviceName, fullPortsByPodName{podname1: containerPorts}) ginkgo.By("Checking if the Service forwards traffic to the TCP and UDP port") execPod := e2epod.CreateExecPodOrFail(ctx, cs, ns, "execpod", nil) err = testEndpointReachability(ctx, service.Spec.ClusterIP, 80, v1.ProtocolTCP, execPod, 30*time.Second) if err != nil { framework.Failf("Failed to connect to Service TCP port: %v", err) } err = testEndpointReachability(ctx, service.Spec.ClusterIP, 80, v1.ProtocolUDP, execPod, 30*time.Second) if err != nil { framework.Failf("Failed to connect to Service UDP port: %v", err) } ginkgo.By("Checking if the Service forwards traffic to TCP only") service, err = cs.CoreV1().Services(ns).Get(ctx, serviceName, metav1.GetOptions{}) if err != nil { framework.Failf("failed to get Service %q: %v", serviceName, err) } service.Spec.Ports = []v1.ServicePort{svcTCPport} _, err = cs.CoreV1().Services(ns).Update(ctx, service, metav1.UpdateOptions{}) if err != nil { framework.Failf("failed to get Service %q: %v", serviceName, err) } // test reachability err = testEndpointReachability(ctx, service.Spec.ClusterIP, 80, v1.ProtocolTCP, execPod, 30*time.Second) if err != nil { framework.Failf("Failed to connect to Service TCP port: %v", err) } // take into account the NetworkProgrammingLatency // testEndpointReachability tries 3 times every 3 second // we retry again during 30 seconds to check if the port stops forwarding gomega.Eventually(ctx, func() error { return testEndpointReachability(ctx, service.Spec.ClusterIP, 80, v1.ProtocolUDP, execPod, 6*time.Second) }).WithTimeout(30 * time.Second).WithPolling(5 * time.Second).ShouldNot(gomega.BeNil()) ginkgo.By("Checking if the Service forwards traffic to UDP only") service, err = cs.CoreV1().Services(ns).Get(ctx, serviceName, metav1.GetOptions{}) if err != nil { framework.Failf("failed to get Service %q: %v", serviceName, err) } service.Spec.Ports = []v1.ServicePort{svcUDPport} _, err = cs.CoreV1().Services(ns).Update(ctx, service, metav1.UpdateOptions{}) if err != nil { framework.Failf("failed to update Service %q: %v", serviceName, err) } // test reachability err = testEndpointReachability(ctx, service.Spec.ClusterIP, 80, v1.ProtocolUDP, execPod, 30*time.Second) if err != nil { framework.Failf("Failed to connect to Service UDP port: %v", err) } // take into account the NetworkProgrammingLatency // testEndpointReachability tries 3 times every 3 second // we retry again during 30 seconds to check if the port stops forwarding gomega.Eventually(ctx, func() error { return testEndpointReachability(ctx, service.Spec.ClusterIP, 80, v1.ProtocolTCP, execPod, 6*time.Second) }).WithTimeout(30 * time.Second).WithPolling(5 * time.Second).ShouldNot(gomega.BeNil()) }) </ins> /* Release: v1.26 Testname: Service, same ports with different protocols on a Load Balancer Service

Discussion:
see A pod listens on port N, on both TCP and UDP. A service forwards to port N, only TCP. Accessing the service via UDP should fail.
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cc
/assign this was caught with hostPort , but we should have one for Services