SINGLE AUTHENTICATION PORTAL FOR DIVERSE INDUSTRIAL NETWORK PROTOCOLS ACROSS MULTIPLE OSI LAYERS

In an embodiment, a computer-implemented method comprises, receiving an authentication request from a first computing device; in response to receiving the authentication request from the first computing device, performing one or more authentication services on behalf of a second computing device using identity information that is stored in a first data repository; generating, based on data from an access control list maintained at the second computing device, a list of one or more third computing devices; receiving a request from the first computing device to access a third computing device in the list of one or more third computing devices; generating service identity information for authenticating to the third computing device and storing the service identity information in a second data repository; and performing one or more authentication services on behalf of the first computing device using the service identity information that is stored in the second data repository.