OpenShift IPI installation on vSphere fails with : `unable to login to vCenter: Post "https://<vcentre_url>/sdk": context deadline exceeded`

Issue

• OpenShift installation on vSphere via IPI method fails during node creation.

• The machines CR gets created but doesn't reconcile with the cluster.

$ oc get machines -n openshift-machine-api

NAME                                   PHASE  TYPE  REGION  ZONE  AGE
abc-xxx-master-0                                                  20h
abc-xxx-master-1                                                  20h
abc-xxx-master-2                                                  20h
abc-xxx-worker-0-59ddg                                            20h
abc-xxx-worker-0-lnrtw                                            20h
abc-xxx-worker-0-nzq8g                                            20h

• Describing any machine streamlines the following message :-

message: 'Failed to check if machine exists: abc-xxx-master-0: failed
to create scope for machine: failed to create vSphere session: unable to login
to vCenter: Post "https://<vcentre_url>/sdk": context deadline
exceeded (Client.Timeout exceeded while awaiting headers)'

• The necessary prerequisites as per the following doc are already met, including checking necessary permissions, checking vCentre connectivity etc.