kthoren,
the authentication domains are stored in the registry.
On a
oes 2 sp1 server you can run
# /opt/novell/xtier/bin/regedit
registry: cd /local_machine/software/Novell/XTier/Configuration/Xsrv/Authentication Domains
registry: ls
I'm not very familiar with NetStorage, but I would activate a ldap trace on the server and trying to login with a user that cannot be found. On that ldap trace you should see where it tries to find that user and you can check if it searches the contexts you specified.
Rainer