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[T57W] 802.1X EAP-TLS Authentication problem
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HelmiSokrates Offline
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Joined: Aug 2023
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Question [T57W] 802.1X EAP-TLS Authentication problem

we are struggling with implementing 802.1x Authentication on our T57W phones.
But NPS denies the connection due to different reasons.

I'll try to explain our config as simple as possible:

Active Directory
Created AD user with MAC address as username

Microsoft CA (server role)
General / Publish in AD: yes
Certificate template for Client Authentication
Subject Name / Build from AD information: yes
Subject Name / Build from AD information / settings: Fully dist. name, include UPN
Issuance Requirements / This number of authorized signatures: 1
Request Handling / Purpose: Signature and encryption
Request Handling / Allow private key to be exported: yes
Request Handling / Enroll subject without requiring user input: yes
Cryptography / Provider Category: Key Storage Provider
Cryptography / Algorithm: ECDH_P384
Cryptography / Minimum size: 384
Cryptography / Provider: Microsoft Software Key Storage Provider
Cryptography / Request Hash: SHA256

-> I created a cert from this template on behalf of the user created before and this cert is available in the users "Published Certificates" tab

Phone UI settings
For testing I configured the settings directly via the Phone UI (attachment 802.1x_DeviceSettings.png).
  • here i uploaded the user certificate as device certificate
  • CA cert is our root CA certificate
  • identity is the MAC adress of the phone
  • MD5 pwd is empty

Microsoft NPS

NPS Connection Request Policy
User Name regex MAC address
Authentication: Local Computer
-> this works

NPS Network Policy
Nas Port Type = Ethernet
User Groups = AD group that contains specified AD user
Authentication Methods = EAP/PEAP (with EAP type "smartcard or certificate")
Certificate for identification: server cert of NPS server

NPS show following in the event log (shortened):

Network Policy Server denied access to a user.

Contact the Network Policy Server administrator for more information.

Security ID: DOMAIN\123456789012
Account Name: 123456789012
Account Domain: DOMAIN
Fully Qualified Account Name: domain.local/802.1X/Phones/123456789012

Client Machine:
Security ID: NULL SID
Account Name: -
Fully Qualified Account Name: -
Called Station Identifier: 10-4f-58-97-ba-00
Calling Station Identifier: 12-34-56-78-90-12

Authentication Details:
Connection Request Policy Name: ConReqPolPhone
Network Policy Name: NetPolPhone
Authentication Provider: Windows
Authentication Server: server.domain.local
Authentication Type: PEAP
EAP Type: -
Account Session Identifier: -
Logging Results: Accounting information was written to the local log file.
Reason Code: 300
Reason: No credentials are available in the security package

I think I missed a simple setting or something like that, but I don't have any idea what I can try else.

I also read the Whitepaper before, but that doesn't help me:


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08-08-2023 01:38 PM
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[T57W] 802.1X EAP-TLS Authentication problem - HelmiSokrates - 08-08-2023 01:38 PM

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