If you're using a DSN, change the encryption setting from Mandatory to Optional. If the value isn't already specified, add Encrypt = Optional. Solution 2: If the application connection string property already specifies a value of Yes or Mandatory for Encrypt setting, change the value to No or Optional. You can download the driver from Download ODBC Driver for SQL Server. Solution 1: Use the Microsoft ODBC Driver 17 for SQL Server. SSL Provider: The certificate chain was issued by an authority that is not trusted.Ĭlient unable to establish connection Cause If you recently upgraded your SQL Server Native Client 11.0 (Driver=), you might receive error messages that resemble the following messages: If linked servers are required, use the existing supported version of MSOLEDBSQL. This will force the client to trust the certificate without validation.Ĭurrently, MSOLEDBSQL19 prevents the creation of linked servers without encryption and a trusted certificate (a self-signed certificate is insufficient). Solution 3: Add TrustServerCertificate=true to the connection string. For more information, see Encryption and certificate validation. If the connection string doesn't specify any value for Encrypt/Use Encryption for Data, add Use Encryption for Data=Optional to the connection string. For example, Use Encryption for Data=Optional. Solution 2: If the application connection string property already specifies a value of Yes or Mandatory for the Encrypt/Use Encryption for Data setting, change the value to No or Optional. You can download the driver from Release notes for the Microsoft OLE DB Driver for SQL Server. Solution 1: Use Microsoft OLE DB Driver for SQL Server 18.x. Because data encryption is set to ON, the driver tries to validate the server's certificate and fails. The new drivers assume this setting to be ON by default. Older versions of client drivers are designed to assume that data encryption is OFF by default. The error occurs because of a change in the default behavior of the client drivers. The client connection string doesn't explicitly specify a value for encryption property, or the Encryption option wasn't explicitly set or updated in the DSN. The Force encryption setting for the SQL Server instance is set to No. These errors occur if both the following conditions are true: : SSL Provider: The certificate chain was issued by an authority that is not trusted. If you recently upgraded your SQL Server Native Client 11.0 (Provider=SQLNCLI11) application to use Microsoft OLE DB Driver 19 for SQL Server (Provider=MSOLEDBSQL19), you might receive error messages that resemble the following messages: Upgraded to Microsoft OLE DB Driver 19 for SQL Server.
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