Connection to AlwaysOn high availability feature of SQL Server 2012 threw the following alarm:
"Cannot connect to Availability Group: Login failed for user. [0x80131904] (requires acknowledgement)"
RESOLUTION:
1. Make sure SQL Server 2012 components are installed on the Diagnostic Server box
2. The information from the "AlwaysOn High Availability | Availability Groups | Availability Groups Listeners" from SSMS must be used in the Connection Manager of Spotlight
