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Without a specific post-release hotfix (KB 4057117 for SQLNCLI11), you cannot connect to a SQL Server instance that requires TLS 1.2. Even with the hotfix, modern servers may reject the older TDS protocol negotiation. 6. Migration Strategy Off of SQLNCLI If you are maintaining a legacy app and reading this to "fix a connection failure," you should migrate to a supported driver.
Provider=SQLNCLI11;Server=myServer\instance;Database=myDB;Trusted_Connection=yes; microsoft sql native client download
| Legacy Component | Modern Replacement | |------------------|--------------------| | SQLNCLI OLE DB | MSOLEDBSQL (Microsoft OLE DB Driver for SQL Server) | | SQLNCLI ODBC | ODBC Driver 17/18 for SQL Server | Without a specific post-release hotfix (KB 4057117 for