Kerberos and Alternative UPN's

I have a single on premesis W2K8 domain forest which exists within a Disjointed Namespace. I have added an alternative UPN to the domain to accomodate Office 365 federation. My understanding is that although users can logon to my domain with the alternative
UPN of [email protected] access to services will fall back on NTLM because the Kerberos service tickets will be issued for
[email protected] Is it possible and how do I resolve this situation? I need users to logon to our domain with thier alterantive UPN's and have Kerberos issue tickets to services with thier alternative.
Domain Namespace: mydomain.ac.uk
AD Domain: mail.mydomain.ac.uk
Alternative UPN: live.mydomain.ac.uk

Hi,
The UPN suffix is used for resolving to a corresponding zone in DNS, which means, it’s used to find the Domain Controller which can process the logon request, that’s why I gave the example about Office 365 in my last reply.
If you have specified an alternative UPN when you created the user account, then a DNS server (zone) should be set up to resolve the suffix which is different than the default one, no matter the domain is in an on-premises network
or a branch office with less secure network. Otherwise, the user can’t use the alternative UPN to log on, I have tested this, and the user can’t log on using alternative UPN without the extra DNS server (zone). You can try to test this in your environment,
too.
As I mentioned before, when it comes to Kerberos authentication, it doesn’t issue tickets based-on UPN, the Kerberos authentication mechanism issues ticket to the user account. Because these parameters, UPN/suffix/NetBIOS Name,
are used to determine the Domain Controller which is used to process logon requests, once determined, tickets are associated with user account, could be bind to SID or GUID or both.
More information for you:
Technologies for Federating Multiple Forests
http://technet.microsoft.com/en-us/library/dd560679(v=WS.10).aspx
How the Kerberos Version 5 Authentication Protocol Works
http://technet.microsoft.com/en-us/library/cc772815(v=WS.10).aspx
Best Regards,
Amy

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