Using Radius on Windows 2003 with Cisco VPN Concentrator or other Cisco Devices
The Cisco VPN Concentrator is one of my most beloved devices from Cisco 
I do not understand why Cisco stopped supporting and selling this device, perhaps because they integrated most of the feature into the IOS. Nevertheless it is a dedicated device which is optimized only for VPN Connections.
After the “few clicks” experience the VPN Concentrator should allow the users of your network to access your internal network from anywhere using VPN Dial In. What most system administrators, like me, do not like – is administer another user and password database besides their Active Directory database. For this reason I collected two important sites which address this topic:
- Configuring the Cisco VPN 3000 Concentrator with MS RADIUS
- Using RADIUS Servers with VPN 3000 Products
Most important is to set the authentication profile right – like in the screenshot and don’t forget to tick “Unencrypted authentication”
The same procedure can be used for all other Cisco Devices – only difference is the configuration of the device itself.
