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RADIUS Failures for some users when using Azure MFA with Netscaler Gateway

Scott Marshall

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Hello, I have successfully enabled Microsoft Azure MFA in our Netscaler Gateway for accessing our Storefront\XenApp environment.  This is working well for everyone except for a few users who are not getting an authentication challenge from their selected MFA notification method (text or authenticator app).  The Citrix Netscaler Login page responds immediately with "incorrect credentials" however the aaad.debug logs show that the LDAP authentication attempt is successful and that the RADIUS server is rejecting the request:


process_radius Received RAD_ACCESS_REJECT for: username
process_rad_reject MS-CHAP error ERROR_AUTHENTICATION_FAILURE (691)


When looking at the RADIUS server (windows server 2016), these failed attempts are being logged in the event viewer with the following message:

NPS Extension for Azure MFA: NPS Extension for Azure MFA only performs Secondary Auth for Radius requests in AccessAccept State. Request received for User username with response state AccessReject, ignoring request.


Does anyone have any ideas as to what could be causing this issue for just a few users?  




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