US Patent 9813303 Enabling cross-realm authentication between tenant and cloud service provider

A first network adapter is inserted into a first resource server of each tenant of a plurality of tenants serviced by a cloud service provider. The first network adapter is configured to be controlled by the cloud service provider. The first resource server of each tenant includes a second network adapter configured to be controlled by the tenant. Each of the first network adapter is operably coupled with an interconnection network infrastructure. The interconnection network infrastructure is operably coupled with cloud service provider infrastructure. Related methods, techniques, apparatuses, systems, non-transitory computer program products, and articles are also described.