Windows Native Authentication ( Kerberos) configuration with OAM 11.1.1.5.1

Hi experts,

The SSO solution works 90% with OAM 11g (11.1.1.5.1) in our deployment.  The final step is to implement WNA with kerberos token.  Following the doc: 1416860.1 

The kinit does not  does not work and  errors out

For e.g

klist -k -t -K -e FILE:$MW_HOME/wna/oamserver.keytab
This works and it shows the keytab

Keytab name: FILE:/home/oracle/oamserver.keytab

KVNO Timestamp         Principal
---- ----------------- --------------------------------------------------------
   5 12/31/69 18:00:00 HTTP/server1.mydomain.com@MYDOMAIN.COM (ArcFour with HMAC/md5)  (0xcf3a5525ee9414229e66279623ed5c58)

When I run the kinit it does not find the keytab entry  which it found while running the "klist" command.