I manage a PDM system for two sister companies, with archives replicated from one server to the other. The two servers are on different domains. We are currently set up with PDM logins, but to make user management easier I want to switch to Windows logins. We've got the domain trust set up, but I'm having trouble with the archive servers' settings. I can get it half way working, where users from the primary domain can log in from either domain, but users from the remote domain can only log in from the primary domain.

Can anyone offer any guidance on the proper way to set this up?