Skype for Business: A network-related or instance-specific SQL error #26 … 1/2

Attempts to manage your UC infrastructure with Skype for Business 2015 Control Panel or Management Shell on a #skype4b Front-End server, FE01 may provoke an error similar to the following:

Get-CsClientVersionPolicy: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network interfaces, error: 26 – Error Locating Server/Instance Specified).

You verified that Windows Firewall exception (port 1433) on the Microsoft SQL Server 201x database backend …

… has been correctly configured. Running ping to the latter succeeded with no failures as well. You determined that FE01 is correctly joined to the Active Directory domain and you are login as domain\administrator with CSAdministrator membership. However, the only active network adapter connection is listed as “Unidentified network – Public network”. You executed the below in PowerShell as Administrator and encountered a strange error:

Set-NetConnetionProfile -InterfaceIndex 12 -NetworkCategory Domain

Set-NetConnetionProfile : Unable to set NetworkCategory to ‘DomainAuthenticated’. This NetworkCategory type will be set automatically when authenticated to a domain network.

So what’s going on?

.. / to be continued


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