question

JasonGodfrey-5248 avatar image
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JasonGodfrey-5248 asked ·

NPS radius clients not authenticating

we have setup NPS on server 2019.
The radius clients have been added and the shared secret has been set. i have verified the network connectivity between the clients and the server in both directions. I can see TCP port 1812 requests coming in from the clients (access points) the user authentication test is failing


I did find this
Reason: Authentication failed due to an EAP session timeout; the EAP session with the access client was incomplete.

How can i troubleshoot this?


How to resolve this?

windows-server-infrastructure
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1 Answer

CandyLuo-MSFT avatar image
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CandyLuo-MSFT answered ·

Hi ,

According to the error message, it is always caused by EAP payload size is large.

You can lower the EAP payload size by configuring the Framed-MTU attribute in network policy settings properties in the NPS console. See if this can solve the problem.

For your reference:

Authentication Failed Due To An EAP Session Timeout; The EAP Session With The Access Client Was Incomplete.

Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

Best Regards,

Candy


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