The default value of `UseTLSTransportForNbd` with OSP13z14 is `false`. However, it is true in OSP13z12 and z13. Suggest updating the description in the Overcloud Parameter guide to include: Default value: * `True` for `openstack-tripleo-heat-templates-8.4.1-65.el7ost` * `False` for `openstack-tripleo-heat-templates-8.4.1-72.el7ost`