When the Microsoft ODBC driver 18 has been installed on a client machine, the following connection errors is encountered when connecting to a SQL Server database from an ArcGIS client.
Connection error Failed to connect to the specified DBMS instance. A database connection exception has occurred. Failure to access the DBMS server.
Connection error Unable to get database list. A database connection exception has occurred. Unable to connect to database server to retrieve database list; please verify your server name, user name, and password info and try again. Failure to access the DBMS server.
Microsoft ODBC Driver 18 for SQL Server includes changes related to encrypted connections that can affect Database Connection behavior in ArcGIS.
These changes include:
This bug has been addressed in the following patches and releases: