kerberos authentication error with Windows 2003 SP1 AD

My operating system is Red Hat Linux AS 4, Kerberos 5, with
postgresql-7.4.14 that I compiled. I can authenticate using ssh, su,
console login, and also have gotten apache mod_auth_kerb to work with AD -
but I am missing something with postgresql. When I try:

[pkoppe01(at)ipswich ~]$ /usr/local/pgsql/bin/psql -d test -h ipswich
psql: Kerberos 5 authentication failed

For the configure step, I did (needed the include statement to prevent an
error about comm_err.h):

[koppel(at)ipswich postgresql-7.4.14]$ ./configure --with-java --with-krb5
--with-includes=/usr/include/et

The make proceeded normally.

My pg_hba.conf looks like this (with pkoppe01 defined in Active Directory
but not defined in postgres using "createuser")

local all all
trust
host test pkoppe01 192.168.1.0 255.255.255.0 krb5

Also have "tcpip_socket = true" and the postgres keytab referenced in
postgresql.conf and the keytab file itself owned by postgres.

When I try the psql command above (as pkoppe01) I do get the service
ticket for postgres:

[pkoppe01(at)ipswich ~]$ klist
Ticket cache: FILE:/tmp/krb5cc_501_LCzZ1P
Default principal: pkoppe01(at)PRIVATE(dot)LAN

Valid starting Expires Service principal
11/13/06 11:17:25 11/13/06 21:17:28 krbtgt/PRIVATE(dot)LAN(at)PRIVATE(dot)LAN
renew until 11/14/06 11:17:25
11/13/06 11:19:02 11/13/06 21:17:28
postgres/ipswich(dot)private(dot)lan(at)PRIVATE(dot)LAN
renew until 11/14/06 11:17:25

Any ideas would be greatly appreciated. Thanks in advance. Please feel
free to email me directly as I just joined the list and don't know my way
around yet.

Paul Koppel
Systems Manager
Washington University School of Medicine
St. Louis, MO 63110