Thanks so much for the input, Sumit. I still can't login, but I think I'm 
getting closer to the root cause. I now see that with my configuration I wasn't 
really using SSSD yet, as resolution was being done by 'compat' -- which would 
itself query NIS.

As you suggested, I replaced 'compat' with 'files' in nsswitch.conf, and bumped 
the sss priority.

But now I believe my problem lies with 'proxy_pam_target': I had set it to 
'none' following my initial reading of the configuration posted in 
https://lists.fedorahosted.org/archives/list/[email protected]/thread/4NT5V5TEFKFCCR5RWG3EHR4LGXXVWYRK/
 (apparently, the only other attempt at doing SSSD+NIS described online). But, 
as also stated there, 'none' is no real keyword and PAM was looking for an 
/etc/pam.d/none target.

Correct me if I'm wrong, but I think I'll need to create a PAM target that 
calls something like
  auth  required  pam_nis.so
... only that Ubuntu doesn't ship a pam_nis.so and I may have to compile one 
myself.

Is there any other way to get a NIS authentication from SSSD? My NIS server 
provides all the required info -- user info + hashed password -- in the passwd 
database (see the getent result above), so it seems possible.

Thanks once more.
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