In in the process of setting up a new DFS Namespace server at a remote site for a customer, I faced an issue where I was unable to utilize the DFS management console to add the remote server as a namespace server. The error received in the DFS Management console was:
The folders cannot be queried. Element not found
After some investigation it turns out that the error was due to a setting the customer had configured:
"Exclude targets outside of the client's site".
After changing the Ordering method back to "Lowest Cost" and waiting 120 minutes for AD Replication and the DFS Namespace to refresh, we were able to configure the DFS Namespace server at the remote site.