diff --git a/contrib/post_test_hook.sh b/contrib/post_test_hook.sh
index 2d2c9aa..4c64ca3 100755
--- a/contrib/post_test_hook.sh
+++ b/contrib/post_test_hook.sh
@@ -27,16 +27,12 @@ TESTS_LIST_REGEX=(
 )
 
 FLAKY_TESTS_LIST=(
-    'Downward API volume [It] should update annotations on modification [Conformance] [Volume]'
+    # https://github.com/kubernetes/kubernetes/issues/44226
     'Downward API volume [It] should update labels on modification [Conformance] [Volume]'
-    'Services [It] should serve multiport endpoints from pods [Conformance]'
 )
 
 FAILING_TESTS_LIST=(
-    'Certificates API [It] should support building a client with a CSR'
-    'DNS [It] should provide DNS for the cluster [Conformance]'
-    'SSH [It] should SSH to all nodes and run commands'
-    'Services [It] should be able to up and down services'
+    # https://github.com/kubernetes/kubernetes/pull/45203
     'Services [It] should create endpoints for unready pods'
 )
 
diff --git a/devstack/plugin.sh b/devstack/plugin.sh
index fc07ab6..af5192f 100755
--- a/devstack/plugin.sh
+++ b/devstack/plugin.sh
@@ -101,6 +101,7 @@ function install_k8s_cloud_provider {
     export KUBE_ENABLE_CLUSTER_DASHBOARD=true
     export ALLOW_SECURITY_CONTEXT=true
     export ENABLE_HOSTPATH_PROVISIONER=true
+    export ENABLE_SINGLE_CA_SIGNER=true
     # Use the docker0's ip address for kubedns to work
     export API_HOST_IP="172.17.0.1"
     export KUBELET_HOST="0.0.0.0"