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Strange Ubuntu 16.04 SSSD / AD Login Issue

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Last Modified: 2019-11-06
I am seeing a strange issue with sssd on Ubuntu 16.04.  I am using sssd to authenticate to AD.  The logins work great and is almost instantaneous as long as you have recently logged in (within the last minute or two).  If you wait longer between logins, then it will login you into, but you do not get a prompt for up to 30 seconds.

Note that these systems are in Azure and our AD is also in Azure.

I am using offline caching and setting the site.  I am stumped as to how to correct this issue.

Below are my conf files (sanitized for security).

-----------------------------------------------------------------------------------------
/etc/sssd/sssd.conf

[sssd]
services = pam, nss
config_file_version = 2
domains = XXXX.COM
sbusTimeout = 30
#debug_level = 7

[domain/XXXX.COM]
id_provider = ad
krb5_realm = XXXX.COM
access_provider = ad
#debug_level = 7
default_shell = /bin/bash
ldap_id_mapping = True
ad_site = XXXXXXX
min_id = 50000
cache_credentials = true

# Use this if users are being logged in at /.
# This example specifies /home/DOMAIN-FQDN/user as $HOME.  Use with pam_mkhomedir.so
override_homedir = /home/XXXX/%u

# Uncomment if the client machine hostname doesn't match the computer object on the DC.
# ad_hostname = mymachine.myubuntu.example.com

# Uncomment if DNS SRV resolution is not workin#g
# ad_server = _srv_

# Uncomment if the AD domain is named differently than the Samba domain
# ad_domain = MYUBUNTU.EXAMPLE.COM

# Enumeration is discouraged for performance reasons.
enumerate = false

[nss]
filter_groups = root
filter_users = root
reconnection_retries = 3

[pam]
reconnection_retries = 3
offline_credentials_expiration = 3


---------------------------------------------------------------------------
/etc/nscd.conf

# logfile /var/log/nscd.log
# threads 14
# max-threads 32
server-user unscd
debug-level 0

enable-cache            passwd  no
positive-time-to-live   passwd  600
negative-time-to-live   passwd  20
suggested-size          passwd  1001
check-files             passwd  yes

enable-cache            group   no
positive-time-to-live   group   3600
negative-time-to-live   group   60
suggested-size          group   1001
check-files             group   yes

# hosts caching is broken with gethostby* calls, hence is now disabled
# by default. Specifically, the caching does not obey DNS TTLs, and
# thus could lead to problems if the positive-time-to-live is
# significantly larger than the actual TTL.
#
# You should really use a caching nameserver instead of nscd for this
# sort of request. However, you can easily re-enable this by default.
enable-cache            hosts   yes
positive-time-to-live   hosts   60
negative-time-to-live   hosts   0
suggested-size          hosts   1001
check-files             hosts   yes

-----------------------------------------------------------------------------------
/etc/smb.conf

#
# Sample configuration file for the Samba suite for Debian GNU/Linux.
#
#
# This is the main Samba configuration file. You should read the
# smb.conf(5) manual page in order to understand the options listed
# here. Samba has a huge number of configurable options most of which
# are not shown in this example
#
# Some options that are often worth tuning have been included as
# commented-out examples in this file.
#  - When such options are commented with ";", the proposed setting
#    differs from the default Samba behaviour
#  - When commented with "#", the proposed setting is the default
#    behaviour of Samba but the option is considered important
#    enough to be mentioned here
#
# NOTE: Whenever you modify this file you should run the command
# "testparm" to check that you have not made any basic syntactic
# errors.

#======================= Global Settings =======================

[global]

workgroup = xxxx
realm = xxxx.com
netbios name = xxxxxxxxxxxx
security = ADS
template shell = /bin/bash
vfs objects = acl_xattr
map acl inherit = Yes
store dos attributes = Yes
client signing = yes
client use spnego = yes
kerberos method = secrets and keytab

## Browsing/Identification ###

# server string is the equivalent of the NT Description field
        server string = %h server (Samba, Ubuntu)

# Windows Internet Name Serving Support Section:
# WINS Support - Tells the NMBD component of Samba to enable its WINS Server
#   wins support = no

# WINS Server - Tells the NMBD components of Samba to be a WINS Client
# Note: Samba can be either a WINS Server, or a WINS Client, but NOT both
;   wins server = w.x.y.z

# This will prevent nmbd to search for NetBIOS names through DNS.
   dns proxy = no

#### Networking ####

# The specific set of interfaces / networks to bind to
# This can be either the interface name or an IP address/netmask;
# interface names are normally preferred
;   interfaces = 127.0.0.0/8 eth0

# Only bind to the named interfaces and/or networks; you must use the
# 'interfaces' option above to use this.
# It is recommended that you enable this feature if your Samba machine is
# not protected by a firewall or is a firewall itself.  However, this
# option cannot handle dynamic or non-broadcast interfaces correctly.
;   bind interfaces only = yes



#### Debugging/Accounting ####

# This tells Samba to use a separate log file for each machine
# that connects
   log file = /var/log/samba/log.%m

# Cap the size of the individual log files (in KiB).
   max log size = 1000

# If you want Samba to only log through syslog then set the following
# parameter to 'yes'.
#   syslog only = no

# We want Samba to log a minimum amount of information to syslog. Everything
# should go to /var/log/samba/log.{smbd,nmbd} instead. If you want to log
# through syslog you should set the following parameter to something higher.
   syslog = 10

# Do something sensible when Samba crashes: mail the admin a backtrace
   panic action = /usr/share/samba/panic-action %d


####### Authentication #######

# Server role. Defines in which mode Samba will operate. Possible
# values are "standalone server", "member server", "classic primary
# domain controller", "classic backup domain controller", "active
# directory domain controller".
#
# Most people will want "standalone sever" or "member server".
# Running as "active directory domain controller" will require first
# running "samba-tool domain provision" to wipe databases and create a
# new domain.
   server role = standalone server

# If you are using encrypted passwords, Samba will need to know what
# password database type you are using.
   passdb backend = tdbsam

   obey pam restrictions = yes

# This boolean parameter controls whether Samba attempts to sync the Unix
# password with the SMB password when the encrypted SMB password in the
# passdb is changed.
   unix password sync = yes

# For Unix password sync to work on a Debian GNU/Linux system, the following
# parameters must be set (thanks to Ian Kahan <<kahan@informatik.tu-muenchen.de> for
# sending the correct chat script for the passwd program in Debian Sarge).
   passwd program = /usr/bin/passwd %u
   passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .

# This boolean controls whether PAM will be used for password changes
# when requested by an SMB client instead of the program listed in
# 'passwd program'. The default is 'no'.
   pam password change = yes

# This option controls how unsuccessful authentication attempts are mapped
# to anonymous connections
   map to guest = bad user

########## Domains ###########

#
# The following settings only takes effect if 'server role = primary
# classic domain controller', 'server role = backup domain controller'
# or 'domain logons' is set
#

# It specifies the location of the user's
# profile directory from the client point of view) The following
# required a [profiles] share to be setup on the samba server (see
# below)
;   logon path = \\%N\profiles\%U
# Another common choice is storing the profile in the user's home directory
# (this is Samba's default)
#   logon path = \\%N\%U\profile

# The following setting only takes effect if 'domain logons' is set
# It specifies the location of a user's home directory (from the client
# point of view)
;   logon drive = H:
#   logon home = \\%N\%U

# The following setting only takes effect if 'domain logons' is set
# It specifies the script to run during logon. The script must be stored
# in the [netlogon] share
# NOTE: Must be store in 'DOS' file format convention
;   logon script = logon.cmd

# This allows Unix users to be created on the domain controller via the SAMR
# RPC pipe.  The example command creates a user account with a disabled Unix
# password; please adapt to your needs
; add user script = /usr/sbin/adduser --quiet --disabled-password --gecos "" %u

# This allows machine accounts to be created on the domain controller via the
# SAMR RPC pipe.
# The following assumes a "machines" group exists on the system
; add machine script  = /usr/sbin/useradd -g machines -c "%u machine account" -d /var/lib/samba -s /bin/false %u

# This allows Unix groups to be created on the domain controller via the SAMR
# RPC pipe.
; add group script = /usr/sbin/addgroup --force-badname %g

############ Misc ############

# Using the following line enables you to customise your configuration
# on a per machine basis. The %m gets replaced with the netbios name
# of the machine that is connecting
;   include = /home/samba/etc/smb.conf.%m

# Some defaults for winbind (make sure you're not using the ranges
# for something else.)
;   idmap uid = 10000-20000
;   idmap gid = 10000-20000
;   template shell = /bin/bash

# Setup usershare options to enable non-root users to share folders
# with the net usershare command.

# Maximum number of usershare. 0 (default) means that usershare is disabled.
;   usershare max shares = 100

# Allow users who've been granted usershare privileges to create
# public shares, not just authenticated ones
   usershare allow guests = yes

#======================= Share Definitions =======================

# Un-comment the following (and tweak the other settings below to suit)
# to enable the default home directory shares. This will share each
# user's home directory as \\server\username
;[homes]
;   comment = Home Directories
;   browseable = no

# By default, the home directories are exported read-only. Change the
# next parameter to 'no' if you want to be able to write to them.
;   read only = yes

# File creation mask is set to 0700 for security reasons. If you want to
# create files with group=rw permissions, set next parameter to 0775.
;   create mask = 0700

# Directory creation mask is set to 0700 for security reasons. If you want to
# create dirs. with group=rw permissions, set next parameter to 0775.
;   directory mask = 0700

# By default, \\server\username shares can be connected to by anyone
# with access to the samba server.
# Un-comment the following parameter to make sure that only "username"
# can connect to \\server\username
# This might need tweaking when using external authentication schemes
;   valid users = %S

# Un-comment the following and create the netlogon directory for Domain Logons
# (you need to configure Samba to act as a domain controller too.)
;[netlogon]
;   comment = Network Logon Service
;   path = /home/samba/netlogon
;   guest ok = yes
;   read only = yes

# Un-comment the following and create the profiles directory to store
# users profiles (see the "logon path" option above)
# (you need to configure Samba to act as a domain controller too.)
# The path below should be writable by all users so that their
# profile directory may be created the first time they log on
;[profiles]
;   comment = Users profiles
;   path = /home/samba/profiles
;   guest ok = no
;   browseable = no
;   create mask = 0600
;   directory mask = 0700

[printers]
   comment = All Printers
   browseable = no
   path = /var/spool/samba
   printable = yes
   guest ok = no
   read only = yes
   create mask = 0700

# Windows clients look for this share name as a source of downloadable
# printer drivers
[print$]
   comment = Printer Drivers
   path = /var/lib/samba/printers
   browseable = yes
   read only = yes
   guest ok = no
# Uncomment to allow remote administration of Windows print drivers.
# You may need to replace 'lpadmin' with the name of the group your
# admin users are members of.
# Please note that you also need to set appropriate Unix permissions
# to the drivers directory for these users to have write rights in it
;   write list = root, @lpadmin

------------------------------------------------------------------------------------
/etc/krb5.conf

[libdefaults]
        default_realm = xxxx.COM

# The following krb5.conf variables are only for MIT Kerberos.
        krb4_config = /etc/krb.conf
        krb4_realms = /etc/krb.realms
        kdc_timesync = 1
        ccache_type = 4
        forwardable = true
        proxiable = true

# The following encryption type specification will be used by MIT Kerberos
# if uncommented.  In general, the defaults in the MIT Kerberos code are
# correct and overriding these specifications only serves to disable new
# encryption types as they are added, creating interoperability problems.
#
# Thie only time when you might need to uncomment these lines and change
# the enctypes is if you have local software that will break on ticket
# caches containing ticket encryption types it doesn't know about (such as
# old versions of Sun Java).

#       default_tgs_enctypes = des3-hmac-sha1
#       default_tkt_enctypes = des3-hmac-sha1
#       permitted_enctypes = des3-hmac-sha1

# The following libdefaults parameters are only for Heimdal Kerberos.
        v4_instance_resolve = false
        v4_name_convert = {
                host = {
                        rcmd = host
                        ftp = ftp
                }
                plain = {
                        something = something-else
                }
        }
        fcc-mit-ticketflags = true

[realms]
        ATHENA.MIT.EDU = {
                kdc = kerberos.mit.edu:88
                kdc = kerberos-1.mit.edu:88
                kdc = kerberos-2.mit.edu:88
                admin_server = kerberos.mit.edu
                default_domain = mit.edu
        }
        MEDIA-LAB.MIT.EDU = {
                kdc = kerberos.media.mit.edu
                admin_server = kerberos.media.mit.edu
        }
        ZONE.MIT.EDU = {
                kdc = casio.mit.edu
                kdc = seiko.mit.edu
                admin_server = casio.mit.edu
        }
        MOOF.MIT.EDU = {
                kdc = three-headed-dogcow.mit.edu:88
                kdc = three-headed-dogcow-1.mit.edu:88
                admin_server = three-headed-dogcow.mit.edu
        }
        CSAIL.MIT.EDU = {
                kdc = kerberos-1.csail.mit.edu
                kdc = kerberos-2.csail.mit.edu
                admin_server = kerberos.csail.mit.edu
                default_domain = csail.mit.edu
                krb524_server = krb524.csail.mit.edu
        }
        IHTFP.ORG = {
                kdc = kerberos.ihtfp.org
                admin_server = kerberos.ihtfp.org
        }
        GNU.ORG = {
                kdc = kerberos.gnu.org
                kdc = kerberos-2.gnu.org
                kdc = kerberos-3.gnu.org
                admin_server = kerberos.gnu.org
        }
        1TS.ORG = {
                kdc = kerberos.1ts.org
                admin_server = kerberos.1ts.org
        }
        GRATUITOUS.ORG = {
                kdc = kerberos.gratuitous.org
                admin_server = kerberos.gratuitous.org
        }
        DOOMCOM.ORG = {
                kdc = kerberos.doomcom.org
                admin_server = kerberos.doomcom.org
        }
        ANDREW.CMU.EDU = {
                kdc = kerberos.andrew.cmu.edu
                kdc = kerberos2.andrew.cmu.edu
                kdc = kerberos3.andrew.cmu.edu
                admin_server = kerberos.andrew.cmu.edu
                default_domain = andrew.cmu.edu
        }
        CS.CMU.EDU = {
                kdc = kerberos.cs.cmu.edu
                kdc = kerberos-2.srv.cs.cmu.edu
                admin_server = kerberos.cs.cmu.edu
        }
        DEMENTIA.ORG = {
                kdc = kerberos.dementix.org
                kdc = kerberos2.dementix.org
                admin_server = kerberos.dementix.org
        }
        stanford.edu = {
                kdc = krb5auth1.stanford.edu
                kdc = krb5auth2.stanford.edu
                kdc = krb5auth3.stanford.edu
                master_kdc = krb5auth1.stanford.edu
                admin_server = krb5-admin.stanford.edu
                default_domain = stanford.edu
        }
        UTORONTO.CA = {
                kdc = kerberos1.utoronto.ca
                kdc = kerberos2.utoronto.ca
                kdc = kerberos3.utoronto.ca
                admin_server = kerberos1.utoronto.ca
                default_domain = utoronto.ca
        }

[domain_realm]
        .xxxx.com = xxxx.COM
        xxxx.com = xxxx.COM
        .mit.edu = ATHENA.MIT.EDU
        mit.edu = ATHENA.MIT.EDU
        .media.mit.edu = MEDIA-LAB.MIT.EDU
        media.mit.edu = MEDIA-LAB.MIT.EDU
        .csail.mit.edu = CSAIL.MIT.EDU
        csail.mit.edu = CSAIL.MIT.EDU
        .whoi.edu = ATHENA.MIT.EDU
        whoi.edu = ATHENA.MIT.EDU
        .stanford.edu = stanford.edu
        .slac.stanford.edu = SLAC.STANFORD.EDU
        .toronto.edu = UTORONTO.CA
        .utoronto.ca = UTORONTO.CA

[login]
        krb4_convert = true
        krb4_get_tickets = false
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CERTIFIED EXPERT
Commented:
remove the realm entries and domain realm emntries that are not being used
Craig SharpLead Enginneer - Unix Server Team

Author

Commented:
Cleaning up the file has helped. Thank you