I've tried following this guide to set up realmd and sssd with active directory: http://funwithlinux.net/2014/04/join-ubuntu-14-04-to-active-directory-domain-using-realmd/ When I run the command realm –verbose join domain.company.com –user-principal=c-u14-dev1/[email protected] –unattended everything seems to connect. My sssd.conf looks like the following: [nss] filter_groups = root filter_users = root reconnection_retries = 3 [pam] reconnection_retries = 3 [sssd] domains = DOMAIN.COMPANY.COM config_file_version = 2 services = nss, pam [domain/DOMAIN.COMPANY.COM] ad_domain = DOMAIN.COMPANY.COM krb5_realm = DOMAIN.COMPANY.COM realmd_tags = manages-system joined-with-adcli cache_credentials = True id_provider = ad krb5_store_password_if_offline = True default_shell = /bin/bash ldap_id_mapping = True use_fully_qualified_names = True fallback_homedir = /home/%d/%u access_provider = ad My /etc/pam.d/common-auth looks like this: auth [success=3 default=ignore] pam_krb5.so minimum_uid=1000 auth [success=2 default=ignore] pam_unix.so nullok_secure try_first_pass auth [success=1 default=ignore] pam_sss.so use_first_pass # here's the fallback if no module succeeds auth requisite pam_deny.so # prime the stack with a positive return value if there isn't one already; # this avoids us returning an error just because nothing sets a success code # since the modules above will each just jump around auth required pam_permit.so # and here are more per-package modules (the "Additional" block) auth optional pam_cap.so However, when I try to SSH into the machine with my active directory user, I see the following in auth.log: Aug 21 10:35:59 c-u14-dev1 sshd[11285]: Invalid user nwalke from myip Aug 21 10:35:59 c-u14-dev1 sshd[11285]: input_userauth_request: invalid user nwalke [preauth] Aug 21 10:36:10 c-u14-dev1 sshd[11285]: pam_krb5(sshd:auth): authentication failure; logname=nwalke uid=0 euid=0 tty=ssh ruser= rhost=myiphostname Aug 21 10:36:10 c-u14-dev1 sshd[11285]: pam_unix(sshd:auth): check pass; user unknown Aug 21 10:36:10 c-u14-dev1 sshd[11285]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=myiphostname Aug 21 10:36:10 c-u14-dev1 sshd[11285]: pam_sss(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=myiphostname user=nwalke Aug 21 10:36:10 c-u14-dev1 sshd[11285]: pam_sss(sshd:auth): received for user nwalke: 10 (User not known to the underlying authentication module) Aug 21 10:36:12 c-u14-dev1 sshd[11285]: Failed password for invalid user nwalke from myip port 34455 ssh2 What do I need to do to allow active directory users the ability to log in?