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Always On VPN, IKEv2 - Authentication failed due to an EAP session timeout

Simon Belmont 20 Reputation points
2024-04-21T08:03:41.3633333+00:00

In our AlwaysOnVPN environment clients are having certain issues when making an IKEv2 connection. The first couple of connection attempts give this error (before a successful connection is eventually made) https://i.ibb.co/0yj7jwM/ikev2.png

Event Logs are these,

Application log on client (EventID 20227): The user Test01 dialed a connection named AlwaysOn which has failed. The error code returned on failure is 812.

NPS Server Log (EventID 6274): Authentication failed due to an EAP session timeout; the EAP session with the access client was incomplete. EventID 6274 is logged three times. (This warning/error is sometimes logged even when connection eventually succeeds)

VPN Server Log (EventID 20271 and 20255): Same error as the one in screenshot above.

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  1. Simon Belmont 20 Reputation points
    2024-04-30T11:55:16.0033333+00:00

    I noticed that this only occurs when VPN server fluctuates between NPS servers. There are two NPS servers in this configuration, and when the VPN server goes from using NPS-Server01 to NPS-Server02, this issue occurs.

    EventID 6274 has no information about the following things,

    Network Policy: - (should have been name of the policy, not "dash")
    Authentication Type: - (should have been PEAP, not "dash")
    EAP Type: - (should have been Smart Card or Certificate, not "dash"

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