root login via Kerberos5 - "User not known to the underlying authentication module" - why?

[Wendy Lin]

On 29 March 2014 16:07, steve <steve at steve-ss.com> wrote:
> On Sat, 2014-03-29 at 14:01 +0100, Wendy Lin wrote:
>
>> login: pam_krb5[3808]: user 'root' was not authenticated by pam_krb5,
>> returning "User not known to the underlying authentication module"
>
> Hi
> Can root get a ticket?
> kinit -k root -t /etc/krb5.keytab

# klist
klist: No credentials cache found (ticket cache DIR::/run/user/0/krb5cc/tkt)
# kinit -k root -t /etc/krb5.keytab
kinit: Password incorrect while getting initial credentials

What do the messages indicate?

Wendy