A network-related or instance-specific error ocurred while establishing a conection to SQL Server

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A network-related or instance-specific error ocurred while establishing a conection to SQL Server.

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  1. Make sure you use the latest version, i.e. v2024.4 as of today.
  2. Make sure you have installed .NET Framework 4.7.2 (or newer) developer pack, see system requirements. (Unlike older versions, v2024 connects to databases by .NET Framework.)
  3. Make sure your MSSQL server supports TCP/IP connecton (not just named pipe).
  4. Make sure the port number you entered is correct, especially if your SQL Server is not using default port number.
  5. If you have firewall, make sure the port is not blocked.