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If you expose connection string altering to systems administrators or application users, leave it up to management personnel.

That's all what you shall to do regarding transport security for SQL client. ADO.NET clients use Windows built-in certificate chaining engine to validate server certificate.

Covert channels Malware operators can use TLS to obfuscate command and control traffic. If TrustServerCertificate is set to False, then client will fail if either, SQL does not implement TLS or server certificate is not valid according to validation rules. In February 2021, for instance, droppers made up over 90 percent of the TLS C2 traffica figure that closely matches the static C2 detection telemetry data associated with similar malware month-to-month from January through March of 2021. If it is set to True, client will fallback to insecure transport (if SQL server does not implement TLS) and will accept arbitrary certificate (potentially, untrusted, or MITM) when presented by server.īy default and when not configured, SQL server automatically generate a self-signed certificate to clients that require secure transport. The behavior of connection is controlled using TrustServerCertificate connection parameter. If you need secure channel to SQL server, just insert encrypt=true in SQL connection string. You don't need to do anything specific in this regard.