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Windows server 2016 RADIUS server IAS_AUTH_FAILURE RRS feed

  • Question

  • Hi,

    I had a working setup for RADIUS server on windows server 2016 and could successfully authenticate from mikrotik router, but for some reason it stopped working. The message I get from event viewer for NPS server is:

    Reason Code: 16
    Reason: Authentication failed due to a user credentials mismatch. Either the user name provided does not map to an existing user account or the password was 

    I have looked in IN file log for some extra information and it says:

    Reason-Code: IAS_AUTH_FAILURE

    I'm using MS-CHAPv2 authentication in network policy.

    I cannot pinpoint if it happen after some certificate expired or after routine password update which is mandated by AD (maybe it has nothing to do with this). Really don't know where to look further. Any suggestions where to look or what to check is welcome.

    I know that this isn't a lot of information but I'll be happy to provide it in order to debug this.


    • Edited by davobo Friday, January 1, 2021 12:40 AM
    Thursday, December 31, 2020 11:32 PM

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