dotnet/Documentation/compatibility/sqlconnection_open-fails-on-windows-7-with-non-ifs-winsock-bsp-or-lsp-present.md

SqlConnection.Open fails on Windows 7 with non-IFS Winsock BSP or LSP present

Scope

Minor

Version Introduced

4.5

Version Reverted

4.5.2

Source Analyzer Status

Planned

Change Description

xref:System.Data.SqlClient.SqlConnection.Open and xref:System.Data.SqlClient.SqlConnection.OpenAsync(System.Threading.CancellationToken) fail in the .NET Framework 4.5 if running on a Windows 7 machine with a non-IFS Winsock BSP or LSP are present on the computer.

To determine whether a non-IFS BSP or LSP is installed, use the netsh WinSock Show Catalog command, and examine every Winsock Catalog Provider Entry item that is returned. If the Service Flags value has the 0x20000 bit set, the provider uses IFS handles and will work correctly. If the 0x20000 bit is clear (not set), it is a non-IFS BSP or LSP.

• Quirked
• Build-time break

Recommended Action

This bug has been fixed in the .NET Framework 4.5.2, so it can be avoided by upgrading the .NET Framework. Alternatively, it can be avoided by removing any installed non-IFS Winsock LSPs.

Affected APIs

• M:System.Data.SqlClient.SqlConnection.Open
• M:System.Data.SqlClient.SqlConnection.OpenAsync(System.Threading.CancellationToken)

Category

Data

More information