OK, I will make this short and provide details as requested, and it may just be a silly question.
I have two Server 2K8 R2 SP1 servers running DFS replication. I have verified that this works as expected. But, when I try to use the 'Diagnostic Reports' in the DFS management MMC, it fails every time with a DCOM issue:
Cannot connect to reporting DCOM server.
Description: The RPC server is unavailable.
Last occurred: Tuesday, April 26, 2011 at 2:18:43 PM (GMT-6:00)
Suggested action: Verify that the DFS Replication Service is installed on the server and that RPC traffic is not blocked by firewalls or port filtering. For information about troubleshooting RPC issues see RPC KB 839880.
The firewall is not blocking this traffic, so I am at a loss why the actual replication works but not the test?