Trust relationship issue?

My problem is related to SQL Server.

Many users are having access denied, even being members of a Windows group
which has access to the SQL Server 2000 SP4 instance.
They can access the instance only if I explicitly add a login for each user.
I'm sure that there is no group with Deny Access.

The SQL Server is member of domain A and the groups mentioned and their
membership are members of domain B.
I know there is an external trust relationship between A and B. Users from A
cannot access domain B, but domain B can access resources on domain A.
Logins created for groups from the same domain (A) as the server are working
correctly. Only groups from the other domain (B) are not working.
Can it be related to trust relationship?

Does anybody know why it's happening?


.

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