US Patent 9450944 System and method for pass-through authentication

A gateway device comprising a processor and a memory, the processor is configured to receive a login operation request from an external endpoint, the login operation request including a user identifier and user login credentials of a user. The processor is also configured to construct an authentication request including the user identifier and the user login credentials and transmit the authentication request to an internal directory service. The processor is further configured to receive an authentication response from the internal directory service, the authentication response including an authentication identifier for the user, and store the authentication identifier in the memory, the authentication identifier for use by the processor in pass-through impersonation of the user.