5440 Endpoint abandoned EAP session and started new

[alliasneo1]

Hi,

Any ideas what might be the problem when I get this error? The dot1x authentication is failing for a Windows 10 machine with this:

Failure Reason	5440 Endpoint abandoned EAP session and started new
Resolution	Verify known NAD or supplicant issues and published bugs. Verify NAD and supplicant configuration.
Root cause	Endpoint started new authentication while previous is still in progress. Most probable that supplicant on that endpoint stopped conducting the previous authentication and started the new one. Closing the previous authentication.

Steps

	11001	Received RADIUS Access-Request
	11017	RADIUS created a new session
	15049	Evaluating Policy Group
	15008	Evaluating Service Selection Policy
	15048	Queried PIP - Normalised Radius.RadiusFlowType
	11507	Extracted EAP-Response/Identity
	12500	Prepared EAP-Request proposing EAP-TLS with challenge
	12625	Valid EAP-Key-Name attribute received
	11006	Returned RADIUS Access-Challenge
	11001	Received RADIUS Access-Request
	11018	RADIUS is re-using an existing session
	12301	Extracted EAP-Response/NAK requesting to use PEAP instead
	12300	Prepared EAP-Request proposing PEAP with challenge
	12625	Valid EAP-Key-Name attribute received
	11006	Returned RADIUS Access-Challenge
	11001	Received RADIUS Access-Request
	11018	RADIUS is re-using an existing session
	12302	Extracted EAP-Response containing PEAP challenge-response and accepting PEAP as negotiated
	12318	Successfully negotiated PEAP version 0
	12800	Extracted first TLS record; TLS handshake started
	12805	Extracted TLS ClientHello message
	12806	Prepared TLS ServerHello message
	12807	Prepared TLS Certificate message
	12808	Prepared TLS ServerKeyExchange message
	12810	Prepared TLS ServerDone message
	12305	Prepared EAP-Request with another PEAP challenge
	11006	Returned RADIUS Access-Challenge
	11001	Received RADIUS Access-Request
	11018	RADIUS is re-using an existing session
	12304	Extracted EAP-Response containing PEAP challenge-response
	12305	Prepared EAP-Request with another PEAP challenge
	11006	Returned RADIUS Access-Challenge
	11001	Received RADIUS Access-Request
	11018	RADIUS is re-using an existing session
	12304	Extracted EAP-Response containing PEAP challenge-response
	12305	Prepared EAP-Request with another PEAP challenge
	11006	Returned RADIUS Access-Challenge
	11001	Received RADIUS Access-Request
	11018	RADIUS is re-using an existing session
	12304	Extracted EAP-Response containing PEAP challenge-response
	12305	Prepared EAP-Request with another PEAP challenge
	11006	Returned RADIUS Access-Challenge
	11001	Received RADIUS Access-Request
	11018	RADIUS is re-using an existing session
	12304	Extracted EAP-Response containing PEAP challenge-response
	12318	Successfully negotiated PEAP version 0
	12810	Prepared TLS ServerDone message
	12812	Extracted TLS ClientKeyExchange message
	12803	Extracted TLS ChangeCipherSpec message
	12804	Extracted TLS Finished message
	12801	Prepared TLS ChangeCipherSpec message
	12802	Prepared TLS Finished message
	12816	TLS handshake succeeded
	12310	PEAP full handshake finished successfully
	12305	Prepared EAP-Request with another PEAP challenge
	11006	Returned RADIUS Access-Challenge
	5440	Endpoint abandoned EAP session and started new (Step latency=90027 ms)

[ammahend]

Review steps in this post and let us know if this does not help

[nishapatle61]

I too had this prb , I will try and update .

[Pulkit Mittal]

Check the endpoint config for dot1x and the certificate in use in ISE

[Pulkit Mittal]

Verify to check if the endpoint is configured properly for 802.1X, and the certificate provisioned in ISE is using a public-signed CA. 

If you find this useful, please mark it helpful and Accept the Solution.