Before creating a two-way trust, it is essential to understand the needs of your Active Directory structure and the needs of the associated organization. The following steps may need to be taken:

1. Verify Active Directory Topology:
   Ensure that all domains and forests contain at least one Global Catalog Server (GCS).


2. Check DNS Settings:
   Confirm that all domains are properly configured with DNS and accessible from the other domain.


3. Verify Name Suffix Routing:
   Determine if name suffix routing is configured for the domains, forests, or both.


4. Set Trust Direction:
   There are three possible trust directions, one-way, two-way, and forest-wide.


5. Enable Domain-Wide Authentication:
   Configure the trust to accept domain-wide authentication from the other domain.