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UPN Suffix not available for local login / authentication on domain despite AD D&T added

For testing purposes, I have a Windows 2003 Server (64bit) installed and configured as PDC running DNS on a local domain, "LOCAL.TESTDOMAIN". I have configured alternate UPN suffixes in AD Domains and Trusts, such as MYDOMAIN.COM. Although creating a new user, using that UPN suffix is possible within AD, and the Zone is integrated in DNS, a local workstation who is a member of the domain, LOCAL, can't see any UPN suffixes that are added. Any ideas?
1 Solution
You can't pick the UPN suffixes from the dropdown box during logon; the dropdown box will only display the domain's NetBIOS name (and you don't need to create a DNS zone for the UPN suffix, either).
If you want to use the UPN for logon, just enter it in the user field; note that the dropdown box will be greyed out as soon as you enter the "@".
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