diff --git a/pkg/antctl/raw/check/cluster/command.go b/pkg/antctl/raw/check/cluster/command.go
index a08e5aa1ccb..e5a993ef1ba 100644
--- a/pkg/antctl/raw/check/cluster/command.go
+++ b/pkg/antctl/raw/check/cluster/command.go
@@ -101,6 +101,7 @@ func Run(o *options) error {
 	}
 	ctx := context.Background()
 	testContext := NewTestContext(client, config, clusterName, o.testImage)
+	defer check.Teardown(ctx, testContext.client, testContext.clusterName, testContext.namespace)
 	if err := testContext.setup(ctx); err != nil {
 		return err
 	}
@@ -121,7 +122,6 @@ func Run(o *options) error {
 		}
 	}
 	testContext.Log("Test finished: %v tests succeeded, %v tests failed, %v tests were uncertain", numSuccess, numFailure, numUncertain)
-	check.Teardown(ctx, testContext.client, testContext.clusterName, testContext.namespace)
 	if numFailure > 0 {
 		return fmt.Errorf("%v/%v tests failed", numFailure, len(testsRegistry))
 	}
@@ -205,7 +205,7 @@ func (t *testContext) setup(ctx context.Context) error {
 	}
 	testPods, err := t.client.CoreV1().Pods(t.namespace).List(ctx, metav1.ListOptions{LabelSelector: "component=cluster-checker"})
 	if err != nil {
-		return fmt.Errorf("no pod found for test Deployment")
+		return fmt.Errorf("no Pod found for Deployment %s", deploymentName)
 	}
 	t.testPod = &testPods.Items[0]
 	return nil
diff --git a/pkg/antctl/raw/check/installation/command.go b/pkg/antctl/raw/check/installation/command.go
index ef194994d56..1b9e43a28be 100644
--- a/pkg/antctl/raw/check/installation/command.go
+++ b/pkg/antctl/raw/check/installation/command.go
@@ -148,13 +148,13 @@ func Run(o *options) error {
 	}
 	ctx := context.Background()
 	testContext := NewTestContext(client, config, clusterName, o.antreaNamespace, runFilterRegex, o.testImage)
+	defer check.Teardown(ctx, testContext.client, testContext.clusterName, testContext.namespace)
 	if err := testContext.setup(ctx); err != nil {
 		return err
 	}
 	stats := testContext.runTests(ctx)
 
 	testContext.Log("Test finished: %v tests succeeded, %v tests failed, %v tests were skipped", stats.numSuccess, stats.numFailure, stats.numSkipped)
-	check.Teardown(ctx, testContext.client, testContext.clusterName, testContext.namespace)
 	if stats.numFailure > 0 {
 		return fmt.Errorf("%v/%v tests failed", stats.numFailure, stats.numTotal())
 	}
diff --git a/pkg/antctl/raw/check/installation/test_denyall.go b/pkg/antctl/raw/check/installation/test_denyall.go
index 251332bc949..c0f0dcecc4b 100644
--- a/pkg/antctl/raw/check/installation/test_denyall.go
+++ b/pkg/antctl/raw/check/installation/test_denyall.go
@@ -17,6 +17,7 @@ package installation
 import (
 	"context"
 	"fmt"
+	"time"
 
 	corev1 "k8s.io/api/core/v1"
 	networkingv1 "k8s.io/api/networking/v1"
@@ -27,6 +28,9 @@ type DenyAllConnectivityTest struct {
 	networkPolicy *networkingv1.NetworkPolicy
 }
 
+// Provide enough time for policies to be enforced by the CNI plugin.
+const networkPolicyDelay = 2 * time.Second
+
 func init() {
 	RegisterTest("egress-deny-all-connectivity", &DenyAllConnectivityTest{networkPolicy: &networkingv1.NetworkPolicy{
 		ObjectMeta: metav1.ObjectMeta{
@@ -84,6 +88,7 @@ func (t *DenyAllConnectivityTest) Run(ctx context.Context, testContext *testCont
 		testContext.Log("NetworkPolicy deletion was successful")
 		return nil
 	}()
+	time.Sleep(networkPolicyDelay)
 	testContext.Log("NetworkPolicy applied successfully")
 	for _, clientPod := range testContext.clientPods {
 		for _, service := range services {
diff --git a/pkg/antctl/raw/check/util.go b/pkg/antctl/raw/check/util.go
index 1eb24ab87b9..d17d9b0530f 100644
--- a/pkg/antctl/raw/check/util.go
+++ b/pkg/antctl/raw/check/util.go
@@ -24,6 +24,7 @@ import (
 
 	appsv1 "k8s.io/api/apps/v1"
 	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/client-go/kubernetes"
@@ -216,12 +217,18 @@ func GenerateRandomNamespace(baseName string) string {
 
 func Teardown(ctx context.Context, client kubernetes.Interface, clusterName string, namespace string) {
 	fmt.Fprintf(os.Stdout, fmt.Sprintf("[%s] ", clusterName)+"Deleting installation tests setup...\n")
-	client.CoreV1().Namespaces().Delete(ctx, namespace, metav1.DeleteOptions{})
+	err := client.CoreV1().Namespaces().Delete(ctx, namespace, metav1.DeleteOptions{})
+	if err != nil {
+		fmt.Fprintf(os.Stdout, "Namespace %s deletion failed: %v", namespace, err)
+		return
+	}
 	fmt.Fprintf(os.Stdout, fmt.Sprintf("[%s] ", clusterName)+"Waiting for Namespace %s to be deleted\n", namespace)
-	err := wait.PollUntilContextTimeout(ctx, 2*time.Second, 1*time.Minute, true, func(ctx context.Context) (bool, error) {
+	err = wait.PollUntilContextTimeout(ctx, 2*time.Second, 1*time.Minute, true, func(ctx context.Context) (bool, error) {
 		_, err := client.CoreV1().Namespaces().Get(ctx, namespace, metav1.GetOptions{})
 		if err != nil {
-			return true, nil
+			if errors.IsNotFound(err) {
+				return true, nil
+			}
 		}
 		return false, nil
 	})