Domain trust creation process failed with the following error message:
The operation failed The specified user already exists
Verify the following components:
1. Proper name resolution between 2 domains
2. Required firewall ports are open between 2 domains - http://support.microsoft.com/kb/179442
3. Ihe Users container or the entire domain to see if it already contains an object with the same name (including $) as the domain with which you are creating a trust.