Xirrus wireless radius problems

We are having problems with several of our access points, specifically Xirrus XR-500's.  Set with the identical configuration as multiple others in the building, and correctly broadcasting, authentication fails for new or existing Radius clients.  The only logging states stationACLFailure and Station RadiusAuthFailure.  Any ideas on what's breaking?  The setup works well on all the rest of our Xirrus access points, including several other 500 series access points.  The Radius server is Server 2008 SP2
fxr1216Asked:
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Craig BeckCommented:
Have you added the APs in NPS as RADIUS clients?
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fxr1216Author Commented:
Absolutely.
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Craig BeckCommented:
Ok just checking :-)

Can you post the NPS custom logs for a failed attempt please?
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fxr1216Author Commented:
It never makes it as far as the NPS logs.  There are no failed attempts logged.  Our connections requests are pushed via our Palo Alto firewall/network access server.  Trying to understand more about it, and if it's the failing point.
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Craig BeckCommented:
So can you confirm that the APs can talk to the NPS via the PA firewall?
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fxr1216Author Commented:
Yes, they can.  The PA links ad usernames and IP addresses for filtering.  The access points seem to crash when the Radius request comes in.  On the phone with Xirrus, who might have been able to replicate the problem.
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fxr1216Author Commented:
It looks like the Xirrus APs need a factory reset to overcome the problems.  Standard resets have not accomplished anything.
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fxr1216Author Commented:
Does not result in an understanding of the cause of an error, but resolves its effects.
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WilroffCommented:
Hi,

I do not think you have to reset the ap's.
Go to profile and select the profile.
Push now on  the button "sync arrays".
If this not help login in one of the ap's and go to "system tools"
Now you have the option to test the connection with the NPS server.
Select the option "radius ping"
choose your radius server en push the button "excute"
If this works fine you know your radius connection works, if not you know where to look
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