Symptoms
When the SQLDiag utility runs on a server in a Windows Cluster and at least one computer in this cluster group has a 15-character-long name, the SQLDiag utility would fail. Additionally, you receive the following error message in the SQLDiag output logs:
Note
Error enumerating virtual servers. Is your SQL Server instance clustered?
There are no instances of version 12 on this computer.
Function result: 87. Message: The parameter is incorrect.
Resolution
The issue was first fixed in the following cumulative update of SQL Server:
Recommendation: Install the latest cumulative update for SQL Server
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. We recommend that you download and install the latest cumulative updates for SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.