OpenShift IPI installation on vSphere fails with: SOAP client: POST "/sdk": 503 Service Unavailable

Issue

• Cluster installation fails due to DNS misconfiguration

  • OpenShift Worker nodes fails to be provisioned

  $ oc describe machine ocp4-example-worker-0
  <...>
  Status:
    Conditions:
      <...>
      Message: 'Failed to check if machine exists: ocp4-example-worker-0: failed to create scope for machine: failed to create vSphere session: error setting up new vSphere SOAP client: Post "https://vcenter.example.com/sdk": dial tcp 10.0.0.10:443: connect: connection
      Reason:                ErrorCheckingProvider
      Status:                Unknown
      Type:                  InstanceExists
  <...>
  

  • OpenShift Master nodes get successfully deployed but fails to communicate with vCenter APIs

  $ oc describe machine ocp4-example-master-0
  <...>
  Status:
    Conditions:
      <...>
      Message: 'Failed to check if machine exists: ocp4-example-master-0: failed to create scope for machine: failed to create vSphere session: error setting up new vSphere SOAP client: POST "/sdk": 503 Service Unavailable'
  <...>