OleDB: Results Error,Workflow name:Microsoft.SharePoint.2013.SPDatabase.Connection

Hi,

I have the following alert.Is anyone aware of it?Can anyone help me?

OleDb Module encountered a failure 0x80004005 during execution and will post it as output data item.
Unspecified error : [DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied.

Workflow name: Microsoft.SharePoint.2013.SPDatabase.Connection

Instance name: Configuration Database

Instance ID: {12EE55AA-8080-F1F0-CAE0-01086D0E957E}

Management group: xyz

Thanks