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Date: Fri, 17 Jul 2015 12:04:58 +0200 (CEST)
From: Raimund Sacherer <rs@logitravel.com>
Reply-To: Raimund Sacherer <rs@logitravel.com>
To: Greg Groth <ggroth@gregs-garage.com>
Cc: freebsd-questions@freebsd.org
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Subject: Re: Kerberos
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Hello Greg, 

on a first glance I can't see anything really out of order, if it helps, I use(d) this pages to setup kerberos and apache auth: 
http://www.grolmsnet.de/kerbtut/ 
http://blog.scottlowe.org/2006/08/10/kerberos-based-sso-with-apache/ 

The account you create for the service principal has to be a user account, it does not work with a machine account. 

If you authenticate without the key tab, just a user from the ad (create a user and test a kinit user@EXAMPLE.COM, later klist). Check if a simple user authentication works in the first place. 

Hope that this will help you in any way, 

Best 
Ray