Windows Server® 2008 TCP/IP Protocols and Services

RADIUS Message Exchanges

This section describes common RADIUS message exchanges for the following:

• Authentication of Network Access

• Accounting of Network Access

• RADIUS Proxy Forwarding

Authentication of Network Access

The sets of authentication messages exchanged between a RADIUS client and a RADIUS server are the following:

• Access-Request followed by Access-Accept. This occurs when a RADIUS server successfully authenticates and authorizes a connection on behalf of a RADIUS client. The RADIUS client can commence service to an access client.

• Access-Request followed by Access-Reject. This occurs when a RADIUS server does not successfully authenticate and authorize a connection on behalf of a RADIUS client. The RADIUS client can then attempt to get new ...