NT Trust Relationship (Access is Denied)

I have two servers, and I’m trying to form a trust relationship between them. All permissions are already set (sharing and security). We’ll call the two servers server A and server B. The trust relationship appears to be properly setup, server A can see all folders and access all files on server B. Server B can see all folders but can not access them. When you click on a folder the “Access Is Denied” message pops up. Both servers are running NT Server Back Office with service pack 6a. If any one could help me figure out why server B can’t access server A’s folders, it would be greatly appreciated.