URL:
https://github.com/SSSD/sssd/pull/789
Title: #789: pam_sss: PAM_USER_UNKNOWN if socket is missing
pbrezina commented:
"""
I suppose one needs to actually use some module after `pam_sss`?
"""
See the full comment at
https://github.com/SSSD/sssd/pull/789#issuecomment-476550648