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Attempting to get kerberos authentication working

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Hello,
I'm trying to get kerberos working with postgres 8.4 on openSUSE authenticating against AD. I have the server configured and can do a kinit against my account on the server. I have a keytab file produced by the administrators.

$ klist -kt poe3b.keytab
Keytab name: FILE:bob.keytab
KVNO Timestamp         Principal
---- ----------------- --------------------------------------------------------
   1 12/31/69 19:00:00 HTTP/bob.lab2k.net@LAB2K.NET
I've added
krb_srvname = 'HTTP' to postgresl.conf

When I try and log in from psql on a windows workstation that is on the same AD domain, I get an entry in the log file: FATAL:  GSSAPI authentication failed for user "jdoe", psql gives me:
C:\Program Files\PostgreSQL\8.4\bin>psql -h bob testdb
psql: SSPI continuation error: The specified target is unknown or unreachable
 (80090303)

I tried just doing a kinit from linux without any luck, but I'm not sure if that it is really an issue or not.
$kinit -V -k -t poe3b.keytab HTTP
kinit(v5): Client not found in Kerberos database while getting initial credentials
$ kinit -V -k -t poe3b.keytab HTTP/poe3b.lab2k.net
kinit(v5): Preauthentication failed while getting initial credentials

At this point, I don't know if it is an account issue on the AD server, the keytab file, postgres configuration, psql or something else!!! I did try some linux forums, but no response from there.

Any help much appreciated.

Thanks.

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