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What is the difference in AD Logons

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Last Modified: 2012-05-07
What is the difference in logging onto desktops in ether

usermame:johnd
domain:mydomain

or

username:JohnDoe@mydomain.ParentDomain.com

I have found that using the first method seems to yield more reliable results but I think that the second method is preferred post NT domains. What should we be using and is there any way of using the second method without having to type out @mydomain.ParentDomain.com whenever a different use logs on.
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NikSystems Specialist
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Commented:
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bluntTonyHead of ICT
Top Expert 2009

Commented:
The first login is the older NT4 style login, using the domain NetBIOS name then the user sAMAccountName (e.g. DOMAIN\username)
The second is the newer UPN style login used by post NT4 systems. This uses the username together with the DNS domain name (e.g. username@domain.local).
Both result in exactly the same thing, as they both point to the same user account. They're just both available to provide backward compatibility.
For the UPN style login, if you want to shorten the second section for child domains, as this can start getting long as you have said, you can create a custom UPN suffix for the forest. For example, if you have a user in the domain child.parent.local, instead of them having to type in 'username@child.parent.local', you could create a custom UPN suffix, e.g. 'company', then assign this to the user, so the login would be 'username@company'.
How to create a new UPN suffix : http://support.microsoft.com/kb/243629
After you have created the new UPN suffix, it will be available to choose from the drop down box when you create a user, and you can assign it to existing users on the 'Account' tab of the user properties in ADUC.
Tony.
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