Question

IAS not authentication or logging requests

Asked by: stebyshe

I have a strange situation now.
We had a crash on one of our DCs for a few weeks ago. THis server has now been replaced with a new one (new name and IP).
A few weeks after this exchange, the authentication of computers in the WLAN stopped working. We are running a Cisco WLC4402 Wireless Lan Controller that authenticates computers by RADIUS (MS IAS). I don't know if these two situations are related, but anyway...

Now I see that the WLC is sending requests to IAS. But the IAS does not answer. The request is not logged in eventviewer.
WLC logs : "RADIUS server 192.168.56.22:1812 failed to respond to request (ID 203) for client 00:21:6b:9a:81:8a / user 'unknown'.
Sometimes the request gets logged in the IAS-logfile, but this is about 2-3 out of 4000....
And it seems like the requests that get logged are the ones that is "easy" to reject (user does not have dial-in permission). The requests that have valid certificates (and therefore should be accepted) are not logged.
Now and then the IAS-service stops.

I have tried to set up Network Policy Server on a Windows 2008 server, but the problem is the same....

Coud this be a problem with AD?
To me it seems like the IAS gets a huge workload, and does not manage to look them up...?

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Asked On
2009-08-31 at 05:48:42ID24694547
Tags

Microsoft IAS

,

Cisco WLC

Topics

Microsoft Server

,

Wireless Local Area Network

,

Active Directory

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: tdd97Posted on 2009-08-31 at 07:19:25ID: 25222984

Since the ip address changed on the DC, have you updated this in IAS and matched the shared secret?

 

by: stebyshePosted on 2009-08-31 at 13:29:15ID: 25226185

Yes, have done that.

I have been testing a bit more.
If I have a clean install computer and try to access the wlan, I get an enrty in the IAS/NPS-logfile stating that the computer could not be accepted.

Then I join the computer to the domain. It gets the computer certificate automaticly (Group Policy).
The I add the computer to the security group "WLAN Access" (the requirement in IAS / NPS.
When I try to get access to the WLAN now, I don't get anything in the IAS / NPS log.

 

by: mrnetbiosPosted on 2009-08-31 at 18:51:40ID: 25228020

Did you remember to register the IAS/NPS server as an auth server in AD?
http://technet.microsoft.com/en-us/library/cc780214(WS.10).aspx

It might be useful to review this list:
http://technet.microsoft.com/en-us/library/cc779009(WS.10).aspx

It will be something you forgot along the way.  Keep looking at the Application event logs for problems IAS may be having with the system/network/AD access.

20120131-EE-VQP-002

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