"oc login" unable to reach master API service when fronted by a HAProxy load-balancer

Issue

• Openshift master nodes are fronted by a standalone HAProxy load-balancer (running outside of the Openshift cluster).

• The following parameters in the Openshift master node configuration file (/etc/origin/master/master-config.yaml) are configured to point to load-balancer URLs:

  masterPublicURL: https://<publicfacing_load-balancer_hostname>:8443
  masterURL: https://<privatefacing_load-balancer_hostname>:8443
  

• When trying to login to Openshift cluster, user receives the following error:

  # oc login -u system:admin
  error: EOF