Windows Firewall: ias

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Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

If you are using the default ports for the RADIUS protocol, add UDP ports 1812 and 1813 to the Windows Firewall exceptions list on the IAS server.

If your access servers use UDP port 1645 for authentication requests and UDP port 1646 for accounting requests, or if you have assigned custom ports for the RADIUS protocol, add these ports to the Windows Firewall exceptions list.