I'm having an odd issue with one user getting multiple matching accounts on ISE. This started happening only after a recent upgrade from ISE 2.1 to 2.6 Patch 5. The 4-node ISE deployment is joined to a single AD forest. It's a single domain with no external trust relationships.
The username is unique in AD. Doing a test authentication with the Test User tool confirms it. Yet authentications happening as part of any of the defined policies (VPN, Wireless 802.1x or TACACS) all fail.
Here's an example below. As you can see, ISE initially says it finds a single matching account and then later in the process says there are multiple.
11001 Received RADIUS Access-Request
11017 RADIUS created a new session
15049 Evaluating Policy Group
15008 Evaluating Service Selection Policy
15048 Queried PIP - Airespace.Airespace-Wlan-Id
15048 Queried PIP - Radius.Called-Station-ID
15048 Queried PIP - DEVICE.Device Type
11507 Extracted EAP-Response/Identity
12500 Prepared EAP-Request proposing EAP-TLS with challenge
11006 Returned RADIUS Access-Challenge
11001 Received RADIUS Access-Request ( [step latency=5039 ms] Step latency=5039 ms)
11018 RADIUS is re-using an existing session
11042 Received duplicate RADIUS request; retransmitting previous response
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
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
12811 Extracted TLS Certificate message containing client certificate
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
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
12812 Extracted TLS ClientKeyExchange message
12813 Extracted TLS CertificateVerify 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
11001 Received RADIUS Access-Request
11018 RADIUS is re-using an existing session
12304 Extracted EAP-Response containing PEAP challenge-response
12313 PEAP inner method started
11521 Prepared EAP-Request/Identity for inner EAP method
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
11522 Extracted EAP-Response/Identity for inner EAP method
11806 Prepared EAP-Request for inner method proposing EAP-MSCHAP with challenge
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
11808 Extracted EAP-Response containing EAP-MSCHAP challenge-response for inner method and accepting EAP-MSCHAP as negotiated
15041 Evaluating Identity Policy
15048 Queried PIP - Normalised Radius.RadiusFlowType
15048 Queried PIP - Network Access.EapTunnel
15013 Selected Identity Source - <redacted>
24430 Authenticating user against Active Directory - <redacted>
24325 Resolving identity - <redacted>
24313 Search for matching accounts at join point - <redacted>
24315 Single matching account found in domain - <redacted>
24323 Identity resolution detected single matching account
24343 RPC Logon request succeeded - <redacted>
24402 User authentication against Active Directory succeeded - <redacted>
22037 Authentication Passed
11824 EAP-MSCHAP authentication attempt passed
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
11810 Extracted EAP-Response for inner method containing MSCHAP challenge-response
11814 Inner EAP-MSCHAP authentication succeeded
11519 Prepared EAP-Success for inner EAP method
12314 PEAP inner method finished successfully
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
24715 ISE has not confirmed locally previous successful machine authentication for user in Active Directory
15036 Evaluating Authorization Policy
24209 Looking up Endpoint in Internal Endpoints IDStore - <redacted>
24211 Found Endpoint in Internal Endpoints IDStore
24432 Looking up user in Active Directory - <redacted>
24325 Resolving identity - <redacted>
24313 Search for matching accounts at join point - <redacted>
24320 Multiple matching accounts in forest - <redacted>
24324 Identity resolution detected multiple matching accounts
24417 User's Groups retrieval from Active Directory failed - <redacted>
15048 Queried PIP - <redacted>.ExternalGroups (4 times)
15016 Selected Authorization Profile - DenyAccess
15039 Rejected per authorization profile
12306 PEAP authentication succeeded
11503 Prepared EAP-Success
11003 Returned RADIUS Access-Reject
