Kerberos setup help

Douglas E. Engert deengert at
Wed Oct 24 11:33:22 EDT 2007

Ramesh Rao wrote:
> Hi
> i have 2 win2003 servers , and in one of the system installed AD Server,
> can you please help by sendingthe steps how to configure the Kerberos

Just off the top of my head some issues:

   Start here:

   AD 2003 and newer Kerberos can all do RC4, so you are not limited to DES.

   The Microsoft PAC in a ticket can make the ticket very large
   which might cause problems for some Unix applications

   AD has a password for an account, but an account can have
   multiple UPN and SPNs. (The key for the principal is derived
   by the KDC from the password.) So best to have each service
   principal have its own account.

   Adding accounts with SPNs to AD can be done with ktpass
   Goolge for msktutil that uses OpenLDAP and SASL/gssapi to
   update AD and krytab files.  (Samba can do some of this too.)

   AD can do referrals, Kerberos still uses the krb5.conf [domain_realm]
   So AD clients may have problems finding services registered in
   a non AD realm. There is some way to use the Global Catalog
   to add the mapping.

> Regards
> Ramesh
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  Douglas E. Engert  <DEEngert at>
  Argonne National Laboratory
  9700 South Cass Avenue
  Argonne, Illinois  60439
  (630) 252-5444

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