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I try to join Active Directory and Samba 4 in Ubuntu 12.04.05.
When I run host -t SRV _kerberos._udp.test.sg I get the error:

Host _kerberos._udp.test.sg not found: 3(NXDOMAIN)

meanwhile

$# host -t SRV _ldap._tcp.test.sg 
_ldap._tcp.test.sg has SRV record 0 0 389 4ecapsvsg6.test.sg.
$# host -t A 4ECAPSVSG6.test.sg
4ECAPSVSG6.test.sg has address 10.153.64.5

My /etc/samba/smb.conf:

# Global parameters
[global]
   workgroup = TEST
   realm = TEST.SG
   netbios name = 4ECAPSVSG6
   server role = active directory domain controller
   dns forwarder = 10.153.64.5
   security = ads
   use kerberos keytab = true
   password server = 4ecapsvsg6.test.sg
   allow dns updates = nonsecure and secure
   bind interfaces only = no
   server services = +smb -s3fs
   dcerpc endpoint servers = +winreg +srvsvc
   passdb backend = samba4
   server services = smb, rpc, nbt, wrepl, ldap, cldap, kdc, drepl, winbind, ntp_signd, kcc, dnsupdate, dns 

My /etc/krb5.conf:

[libdefaults]
    default_realm = TEST.SG
    krb4_config = /etc/krb.conf
    krb4_realms = /etc/krb.realms
    kdc_timesync = 1
    ccache_type = 4
    forwardable = true
    proxiable = true
[realms]
     4ECAP.SG = {
          kdc = 4ecapsvsg6.test.sg:88
          admin_server = 4ecapsvsg6.test.sg:749
          default_domain = test.sg
    }
[domain_realm]
    .test.sg = TEST.SG
    test.sg = TEST.SG
[login]
    krb4_convert = true
    krb4_get_tickets = false

My /etc/hosts:

  127.0.0.1       localhost
  127.0.1.1       4ecapsvsg6
  # The following lines are desirable for IPv6 capable hosts
  ::1     ip6-localhost ip6-loopback
  fe00::0 ip6-localnet
  ff00::0 ip6-mcastprefix
  ff02::1 ip6-allnodes
  ff02::2 ip6-allrouters
  10.153.64.5     4ecapsvsg6.test.sg     4ecapsvsg6

What is the solution? Without it I cannot run join domain with command:

sudo net ads join

which comes out error like

Failed to join domain: failed to lookup DC info for domain 'TEST' over rpc: Logon failure

I did kinit administrator and klist, result:

   Ticket cache: FILE:/tmp/krb5cc_0
   Default principal: administrator@TEST.SG
    Valid starting       Expires              Service principal
    26/03/2015 14:29:04  27/03/2015 00:29:04  krbtgt/TEST.SG@TEST.SG
    renew until 27/03/2015 14:29:00

meanwhile i include my /etc/resolv.conf

   # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
   #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

   nameserver 10.153.64.5
   search test.sg
   domain test.sg
1

After i google this past week, lucky i found this site http://edoceo.com/howto/samba4

Happens to be i need to edit my dnsmasq (/etc/dnsmasq.conf) add this line :

srv-host=_kerberos._tcp.test.sg,4ecapsvsg6.test.sg,88 srv-host=_kerberos._tcp.dc._msdcs.test.sg,4ecapsvsg6.test.sg,88 srv-host=_kerberos._udp.test.sg,4ecapsvsg6.test.sg,88

srv-host=_kpasswd._tcp.test.sg,4ecapsvsg6.test.sg,464 srv-host=_kpasswd._udp.test.sg,4ecapsvsg6.test.sg,464

and disable Bind9 (which installed along with Samba4 by default)

Now the problems gone :)

Only one problems remains, how to connect to AD (which i'll open another thread for that)

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