!!!!File Server cannot access Active Directory

Question

Hi,

I am running multiple servers through a domain controlled by windows server 2003. My domain name is "AD". All servers (media, file, application, and database) have been successfully connected to this domain.

There are two groups that have been created in active directory on the domain controller called "Instructor" and "Student." Permissions have been set on that machine to allow read and write, but my problem is that on the file server, I cannot set permissions for these two groups to read or write because my properties dialog box on the file server cannot find either group even though they clearly have been created and are connected through the domain.

I am logged in as a Domain Admin and we do have the same DNS server for both.

DNS server is Open BSD using Dyanmic DDNS. We can see AD from file server, but we cannot change the location from file server (local machine) when adding groups/users in share/NTFS permissions (i.e. we cannot add domain users because it is not found in advanced search).

Any ideas?