Product:
Cognos Planning version 8.4.1

Symptom:
Can not start the Cognos Planning service from Cognos Configuration

Error Message:
Failed HRESULT [0x80004005] :The service failed to start because it could not successfully open a database connection with the Planning Store or the Content Store configured in Cognos Configuration. Details:
Database Errors:  Source: Microsoft OLE DB Provider for SQL Server Description: Login failed for user 'cognos_ps'. The user is not associated with a trusted SQL Server connection. Number: -2147467259 SQLState: 42000 NativeError: 18452

Cause:
The SQL login is setup in Microsoft SQL server management studio, but the SQL server is not set to support mix mode login.

Solution:

Start Microsoft SQL server management studio
Open properties for the SQL server
Change the server security to “SQL server and Windows Authentication mode”
Click OK to save changes.

Restart server and test database connection again from Cognos Configuration.

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