On Wed, 2015-02-18 at 04:50 +0000, Sreekanth Nadendla wrote:
> 
> For #4, It is not clear what you mean by valid service principal. We
> know the rules of constructing an SPN and anything that follows the
> syntax is a valid one.  The Active Directory finds a match to identify
> the user/machine account given an SPN.  As for restrictions on these
> fields, section "3.1.1.5.1.3 Uniqueness Constraints" in MS-ADTS
> answers it.

Specifically, why can I get a ticket to machine$@REALM but not
administrator@REALM?

It is more than the valid construction of the name - something in the
database is different between these two similar cases. 

Thanks,

Andrew Bartlett

-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba


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