FreeRADIUS and Active Directory

Mike Loosbrock m-loosbrock at
Thu Feb 19 17:23:34 CET 2009

On Feb 19, 2009, at 8:28 AM, Tomas wrote:
> My problem is that my windows box has no way of communicating with AD
> server to verify user credentials for initial login screen (reason for
> that is because switch port state is uncontrolled and no other but  
> traffic can pass through)
> Is there any way setting my windows box so that user gets  
> authenticated
> against radius and then AD using single sign on without doing any  
> hacks
> to MS GINA or stuff like that?

Tomas, it sounds like you want the following behavior:

1.) machine boots up
2.) machine 802.1x authenticates, opening switch port for AD  
3.) user enters credentials into OS login screen
4.) machine authenticates user against AD
5.) machine does a 802.1x re-auth with the user's credentials

Windows does support this and (surprise) it actually works well.  
Assuming you're using the native Windows 802.1x supplicant and have  
the non-domain case working, you can get the above behavior by  
enabling the following options in the supplicant: (how you do this  
varies a bit across Windows versions)

'Authenticate as computer when computer information is available'
'Automatically use my Windows logon name and password (and domain if  

Mike Loosbrock
Bethel University Network Services

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