Driver=SQL Server Native Client 11.0;Server=...
The primary purpose of SQL Native Client was to consolidate and specialize. It combined the SQL OLE DB provider and the SQL ODBC driver into a single, native dynamic link library (DLL). By doing so, it stripped away the abstraction layers that slowed down general-purpose drivers. SNAC was "native" in the sense that it communicated directly with the SQL Server Tabular Data Stream (TDS) protocol, allowing it to take full advantage of SQL Server's specific features without the overhead of generic data translation. This resulted in faster performance and reduced complexity for developers building applications strictly for the SQL Server environment. sql native client
...;MARS_Connection=yes;
Users on the Epicor User Help Forum recommend using Native Client 9 or 10 for certain legacy ERP environments to ensure performance and compatibility. : Driver=SQL Server Native Client 11
For specific configuration steps, you can refer to guides like the Crystal Report using UDL walkthrough. By doing so, it stripped away the abstraction