Just a quick blurb today. Was working on setting up a cross site DAG with a customer today. Kept getting an issue where when we tried to add two existing mailbox servers to the DAG, both would fail with an “access denied” error:
A server-side database availability group administrative operation failed. Error: The operation failed. CreateCluster errors may result from incorrectly configured static addresses. Error: The Cluster service couldn’t access the Microsoft Failover Cluster Virtual Miniport network adapter. Verify that other network adapters are working and check Device Manager for errors associated with this adapter. If the configuration for this adapter has changed, you may have to reinstall the Failover Clustering feature on this computer. Learn more at http://go.microsoft.com/fwlink/?linkid=3052&kbid=973838. Error: 1062. —> Microsoft.Exchange.Cluster.Replay.DagTaskNetFtProblemException:
Turns out, in the past, this customer had wiped out their local administrators on the Exchange servers with a group policy run amuck! They added things like Domain Admins in, but didn’t add in “Exchange Trusted Subsystem”. We added that in, DAG creation worked like a charm.