Hi , I would like to implement SSO for my Linux+Windows2012 machines with MFA.

I have installed FreeIPA, it works well  for my Linux client authentication 
with OTP enabled.  However, for Windows client, I can only make it works with 
FreeIPA without OTP.

The Windows machines are 2012 R2 without AD(workgroup only). When I login 
Windows using FreeIPA user accounts enabled with OTP, it shows "An unsupported 
preauthentication mechanism was presented to the Kerberos package", is that not 
supported ? or something I configured wrong?

I setup Windows authentication by referring this link:


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