An Internet Authentication Service (IAS) server uses the Remote Authentication Dial-in User Service (RADIUS) protocol to ...

An Internet Authentication Service (IAS) server uses the Remote Authentication Dial-in User Service (RADIUS) protocol to provide centralized connection authentication, authorization, and accounting for many types of network access, including wireless and virtual private network (VPN) connections. RADIUS servers can also act as proxies, forwarding connection requests to other RADIUS servers.
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