How to fix Error 8054 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 8054 – Incorrect TDS RPC Protocol Stream (Table-Valued Parameter)

Why This Error Happens

Error 8054 occurs when the structure of a Table-Valued Parameter (TVP) sent by the client application does not match the actual user-defined table type definition stored in SQL Server 2025. This mismatch is typically caused by a schema drift—such as a column being added, removed, or reordered in the table type after the client application’s dataset or SQLMetaData objects were compiled. It can also occur due to a corrupted or outdated client driver (ODBC/OLE DB/ADO.NET) that incorrectly serializes the TDS stream before sending it to the server.

Step-by-Step Resolution Guide

Step 1: Verify the User-Defined Table Type Schema

  • Connect to the instance via SQL Server Management Studio (SSMS) and expand Databases > [YourDB] > Programmability > Types > User-Defined Table Types.
  • Run the following query to compare column order, names, and data types against your client-side code: 
  SELECT c.name, t.name as DataType, c.max_length, c.column_id 
  FROM sys.table_types tt 
  JOIN sys.columns c ON tt.type_table_object_id = c.object_id 
  JOIN sys.types t ON c.user_type_id = t.user_type_id
  WHERE tt.name = 'YourTableTypeName' ORDER BY c.column_id;
  • Ensure the client application’s DataTable or List<SqlDataRecord> object matches this exact order.

Step 2: Update and Validate Client Drivers

  • Navigate to the application server (Windows Server 2025 or Windows 11 client) and check the installed driver version via Control Panel > Programs and Features.
  • Update the Microsoft OLE DB Driver for SQL Server or ODBC Driver 18+ to the latest build compatible with SQL Server 2025.
  • If using .NET, ensure the Microsoft.Data.SqlClient NuGet package is updated to the latest stable version in your project file (.csproj).

Step 3: Inspect the SqlCommand Parameter Mapping in Code

  • Open the application source code and locate the SqlParameter object where SqlDbType.Structured is defined.
  • Verify that the TypeName property explicitly matches the schema-qualified name of the SQL table type (e.g., dbo.MyTableType).
  • Check for SqlMetaData definitions in the code; ensure the SqlDbType (e.g., NVarChar, Int) and length constraints exactly mirror the server-side column definitions.

Step 4: Clear Cached Execution Plans

  • If the table type was recently altered, old execution plans might still be cached, causing a conflict with the new structure.
  • Run the following command in SSMS to clear the specific plan cache for the database: 
  DBCC FREEPROCCACHE;
  • Restart the SQL Server (MSSQLSERVER) service via services.msc if the issue persists after clearing the cache.

Alternative or Verification Steps

  • Verification: Run a test transaction using SQL Server Profiler or Extended Events to capture the RPC:Completed event and confirm the TVP data populates without throwing Error 8054.
  • Alternative Fix: If the error persists only for specific rows, check for NULL values being passed into non-nullable columns within the TVP, as this is a common hidden trigger for this specific protocol stream error.