Can you please help me with the below error detail and its resolution ?
Error: ErrorSource: Microsoft OLE DB Provider for SQL Server, ErrorMsg: [DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied.
that's a Microsoft error message rather than a Qlikview one:
Summary
"SQL Server does not exist or access denied" is a generic Microsoft Data Access Components (MDAC) message that indicates that the computer that is running Microsoft SQL Server cannot be contacted. This generic message has many potential causes. Additionally, the following error messages also have similar causes:
SQL Server is unavailable or does not exist.
The specified SQL Server is not found.
Important The "SQL Server does not exist or access denied" message does not indicate the following:
The logon process to SQL Server failed.
SQL Server does not have the correct permissions to process the query.
You cannot use SQL Server authentication because only Windows authentication is permitted.
