Web Reference: Jul 25, 2025 · Microsoft.Data.SqlClient doesn't manage loading/unloading of this library in .NET Core. Recommended Solution: Ensure "Execute" permissions are granted on the filesystem where native runtime libraries are loaded in the .NET Core process. Jan 16, 2026 · In this blog, we’ll demystify why this error occurs, break down the root causes, and provide step-by-step solutions to resolve it. By the end, you’ll have the tools to diagnose and fix login failures in IIS—even if your app works perfectly locally. System.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while extablishing a connection to SQL Server. The server was not found or was not accessible.
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