Internet UDP port 1812 is commonly used by the Remote Authentication Dial-In User Service (RADIUS) protocol. RADIUS is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service. Examples of software that use this protocol include Microsoft's Network Policy Server (NPS) and FreeRADIUS, an open-source implementation of RADIUS. These systems use port 1812 for receiving client requests.
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