Configuring Internet Authentication Services (IAS)

Windows Server 2003 IAS is fully compatible with Windows 2000, so you can mix and match components as you upgrade your system.

If you have an existing third-party RADIUS implementation, you need to check the UDP ports used by the RRAS servers and the RADIUS servers. The current RADIUS standard uses UDP port 1812 for authentication and UDP port 1813 for accounting. Older RADIUS implementations used port 1645 for authentication and 1646 for accounting. If you have existing RADIUS servers or network access servers, they may use the old port number. You can configure IAS to use the old port number if the port conflict does not impact your current operations.

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