Remote Authentication Dial In User Service (RADIUS) is an AAA (authentication, authorization and accounting) protocol for applications such as network access or IP mobility. It is intended to work in both local and roaming situations.

RADIUS is a common authentication protocol utilized by the 802.1x security standard (often used in wireless networks).

     source - RADIUS. (2006, August 30). In Wikipedia, The Free Encyclopedia. Retrieved August 31, 2006, from http://en.wikipedia.org/wiki/RADIUS

Besides authenticating against our internal database of users, Hautspot venues have the ability to authenticate against third party RADIUS servers.