After RHOCP installation, default operators are in degraded state

Issue

After performing IPI installation, default cluster operators like DNS,image registry and authentication are stuck in degradedstate,

• Authentication operator is throwing below error,

status:
  conditions:
    message: |-
      OAuthServerRouteEndpointAccessibleControllerDegraded: Get "https://oauth-openshift.apps.osh.uxb.ipa.vodafone.com/healthz": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
      WellKnownReadyControllerDegraded: failed to GET kube-apiserver oauth endpoint https://100.64.18.17:6443/.well-known/oauth-authorization-server: context deadline exceeded
    reason: OAuthServerRouteEndpointAccessibleController_SyncError::WellKnownReadyController_SyncError
    status: "True"
    type: Degraded

• DNS operator pods are showing error logs which are stating that API is not connected which means that when the dns pod attempts to access the default svc to register itself, it goes through the OpenShift network plugin installed on the platform which is OVN-Kubernetes.

[INFO] plugin/kubernetes: github.com/coredns/coredns/plugin/kubernetes/controller.go:335: failed to list *v1.Service: Get "https://api/v1/services?limit=500&resourceVersion=0": dial tcp <ip>: i/o timeout
[INFO] plugin/kubernetes: Trace[294087934]: "Reflector ListAndWatch" name:github.com/coredns/coredns/plugin/kubernetes/controller.go:335  (total time: 30001ms):
Trace[294087934]: ---"Objects listed" error:Get "https://<ip>/api/v1/services?limit=500&resourceVersion=0": dial tcp <ip>: i/o timeout 30001ms (15:38:35.527)
Trace[294087934]: [30.001249508s] [30.001249508s] END
 [ERROR] plugin/kubernetes: github.com/coredns/coredns/plugin/kubernetes/controller.go:335: Failed to watch *v1.Service: failed to list *v1.Service: Get "https://<ip>/api/v1/services?limit=500&resourceVersion=0": dial tcp <ip>: i/o timeout