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I have a Mac (running OSX 10.9.2) that I have bound to an Active Directory domain I own (domain A). This domain has a two way transative trust to a 2nd domain (domain B). How do I specify the domain to authenticate against when signing in?

Currently I can sign in as a local user, or a user of domain A using no domain prefix (just user, using domainA\user or user@domainA, however those won't work for domain B. I am not an administrator of domain B, so I have no way to bind the Mac to the 2nd domain.

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have you tried domain\username? Or, try user@fqdn – BigHomie Jun 17 '14 at 19:52
Sorry, I should have clarified that. both username, domainA\username and username@domainA all work. None of those three work for domainB. – fireburns Jun 17 '14 at 20:02

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