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Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
This article contains a list of known issues and fixes for the Microsoft OLE DB Driver for SQL Server.
Known issues
- The driver returns the following error message:
Error loading adal.dll from system directory. Verify that Active Directory Authentication Library for SQL Server is properly installed. The most likely cause of this error is incorrect bitness ofadal.dll. It can be caused by the installation of version 19.2.0 of the OLE DB Driver. Version 19.2.0 erroneously places a 64-bit ADAL library into the 32-bit system directory. To resolve this issue, install the OLE DB Driver version 19.3 or higher. It includes ADAL 3.6.1 with the correct bitness. - Currently, MSOLEDBSQL19 prevents the creation of linked servers without encryption and a trusted certificate (a self-signed certificate is insufficient). For more information, see SQL Server 2025 and MSOLEDBSQL version 19.
- Use of MSOLEDBSQL19 within a linked server is only supported on SQL Server 2022 or newer.