[Samba] Problem with Samba4 installation - trouble at kinit

[Lee Allen]

Hi.  I am following the steps in the Samba4 HOWTO:
http://wiki.samba.org/index.php/Samba4/HOWTO
and I run into trouble at this step:

[root at samba-ad ~]# kinit administrator at ALLENLAN.NET
"kinit: Cannot contact any KDC for realm 'ALLENLAN.NET' while getting
initial credentials"

I performed all of the previous testing steps in the document successfully.

This is CentOS 6.3.  I started with Ubuntu 12.10 and ran into the same
problem there, so clearly it's something I am doing wrong.

When Samba is running, there is no listening socket on port 88.

Does Samba implement the kerberos functionality internally?  If so, does it
specifically look for /etc/krb.conf?

If Samba does not implement Kerberos, should I have a Kerberos server
running?  I am very unfamiliar with Kerberos. Which package should I have
installed?

Thank you.