IAS Server Event ID 3: Reason Code 5 - WLAN Authentication failure

Hi, i am looking for some help with a recent issue with our RADIUS/
WLAN problem.

I recenty configured a test WLAN to use RADIUS/CA/AD authentication.

Getting it all working was not too bad, and in fact it worked for over
one month. In the last week however, i cannot get any client machines
to authenticate. The wireless connection will hang at 'waiting for
authtication' and then fail miserably! As fas as i can recall i have
not made any chnages that would affect this authentication.

I am getting the loowing event in the IAS server logs:

Event Type: Error
Event Source: IAS
Event Category: None
Event ID: 3
Date: 29/04/2009
Time: 14:11:19
User: N/A
Computer: WMESEC01
Description:
Access request for user \ was discarded.
Fully-Qualified-User-Name = \
NAS-IP-Address = 147.114.179.99
NAS-Identifier = 001c10667328
Called-Station-Identifier = 001c10667328
Calling-Station-Identifier = 00166fbca417
Client-Friendly-Name = WAP01
Client-IP-Address = 147.114.179.99
NAS-Port-Type = Wireless - IEEE 802.11
NAS-Port = 15
Proxy-Policy-Name = Use Windows authentication for all users
Authentication-Provider = Windows
Authentication-Server = <undetermined>
Reason-Code = 5
Reason = The user account domain cannot be accessed.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 00 00 00 00 ....

Intially i found a hotfix, in KB Article Number(s): 946813 - this did
not resolve the issue.

I have been looking ion the IAS logs but the last entry was over one
week ago for some reason even though i have been attempting to connect
to WLAN today, so i cant see whats going on - its like the
authentication request isn't making it to IAS.

From the IAS server i can contact DC no problem. I also use Portqry to
verify port is open for 389.

Certificates are on the client machines in question in Trusted Root
Cert Authorities, using GPO. RADIUS access policy has not chnaged
since it was originally working.

I am struggling where to look next with this.

I would appreciate any suggestions!

Cheers,

Colin Laurie


.

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