Windows didn't join to Samba 4

[mustafa evelioglu]

I'm trying to install the Samba4 . Step by Step with the Samba4Wiki

I've got two problem

1) Step 8 (optional): configure Server-side DNS
    Test: dig _ldap._tcp.dc._msdcs.samba5.local SRV @localhost

My output:  no ANSWER SECTION:  it's a problem ?
--------------------------------------------------------------------------------------------------------------------------------------
; <<>> DiG 9.3.4-P1.1 <<>> _ldap._tcp.dc._msdcs.samba5.local SRV @localhost
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 40365
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;_ldap._tcp.dc._msdcs.samba5.local. IN  SRV

;; AUTHORITY SECTION:
.                       9306    IN      SOA     A.ROOT-SERVERS.NET. 
NSTLD.VERISIGN-GRS.COM. 2008092300 1800 900 604800 86400

;; Query time: 4 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Sep 23 21:27:33 2008
;; MSG SIZE  rcvd: 126
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  * Configure Windows XP Pro client to join Samba 4 Active Directory*

2) Step 3: Joining windows XP Pro into Domain

I got a Error:

The following eror occurred attempting to join the domain "EXAMPLE.COM":
LOGON failure: unkown user name or bad password.

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But test in step 7 was ok