ACS 5.2 Error message: 5405 RADIUS Request dropped

The error message "5405 RADIUS Request dropped", what does it meen ?.
We have implemented 802.1X on a C4506 switch running IOS 12.2(53), it has worked fine for about 3 months but now I get users not able to authenticate. In the loggs on the ACS I get the obove message.
ACS 5.2 is running 5.2.0.26 Build 3075.
Has anyone have hade the same problem ?

It's fixed in 5.3...
http://www.cisco.com/en/US/docs/net_mgmt/cisco_secure_access_control_system/5.3/release/notes/acs_53_rn.html
...or stop/start ACS as a workaround till it's happen again.
Kind regards,
Ron

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ISE v1.2 - Status-Server - 5405 RADIUS Request dropped

Just a note:
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Event: 5405 RADIUS Request dropped
Failure Reason: 11031 RADIUS packet type is not a valid Request
Root cause: RADIUS packet type is not a valid Request.
Wireshark shows:-
Code: Status-Server (12)
Attribute Value Pairs:
AVP: l=6 t=Service-Type(6): Shell-User(6)
AVP: l=18 t=Message-Authenticator(80): df48bb4b50f0a772bd7c891ef6548c68
AVP: l=6 t=NAS-IP-Address(4): 10.1.1.1
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Neno
Nothing to do with that,
The devices will use RADIUS to authenticate fine; databass, credentials, etc fine.
However they send keepalives to validate the RADIUS server is still there. ISE doesn't implement this and ISE logs get full of rejections. The end devices are unable to prioritise which ISE to used based on up/down. But still work.
This was just a note to everyone so they are aware of the issue,

ISE-5443 RADIUS request dropped due to reaching EAP sessions limit

Hi Guys,
I am getting the below error message from two PSNs (out of 4) & resulting 95% failed authentications on ISE
"5443 RADIUS request dropped due to reaching EAP sessions limit"
Could not find any documents/reference & trying to get on hold TAC in the mean time.
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TIA
Rasika

Hi Scott,
Thanks for that..
here is bit more information about this evnts log in ISE system (1.2 Patch 4).
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Failure Reason :5443 RADIUS request dropped due to reaching EAP sessions limit
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It is not heavily loaded environment (3k wireless clients) at the moment & bit scary since we are expecting around 15k when students are back in early March. Authentication failure rate is around 100 in every 15-20s interval. Not sure what is the limitation of the ISE system itself to handle number of EAP sessions per second.
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2.- S-User and password should be active
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4.- It might be that you are not licensed for the product you want to download.
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ACS 5.2 Error message: 5405 RADIUS Request dropped

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