I have a two-way transitive forest trust between two Windows 2003 forests.
My forest has one domain (A), the other has two (B and C).
I can login to domain B from a machine that is a member of domain A, but domain C does not appear in the drop-down list of domains when logging in to windows.
I can connect to both domains B and C in AD Users and Computers and browse the OUs. I can also add users from B and C to ACLs for files and folders in domain A, and add users from B and C in to security groups in domain A.
So it seems the only functionality I'm missing is the ability to login to domain C from a machine in domain A.
Since this is a transitive trust I expect this to work, but what could be the problem and where do I begin troubleshooting.