Sometime ago I was working with a customer on migrating the windows Server 2003 based Radius - Internet Authentication Service (IAS) to Windows Server 2008 R2 based Network Policy Server (NPS), so I thought to provide the steps as some other blogs are missing some steps:
To perform this migration, perform the following steps:
Copy IASmigreader.exe from the Windows Server 2008 R2 installation media at \sources\dlmanifests\microsoft-windows-iasserver-migplugin folder to the Windows 2003 server and run as shown below to export the IAS configurations. It will create the configuration file:
Open the IAS.txt file and find the following text:
================================================= SystemInfo ================================================= 0 16 515
Replace the text with:
================================================= SystemInfo ================================================= 0000000009 16 515
Save and import the changed file. This is referenced in http://support.microsoft.com/kb/979599
Copy the ias.txt file that is generated in the above command and updated as mentioned above to the Windows Server 2008 R2 and import the configuration like so:
At the 2008 R2 Server:
Open NPS console and verify the configurations have been successfully imported.
Also register your NPS service in Active Directory from the NPS console.
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