Login failed for user 'username'. The user is not associated with a trusted SQL Server connection. (Microsoft SQL Server, Error: 18452)

Cause::

The SQL server has been configured to operate in "Windows Authentication Mode (Windows Authentication)" and doesn't allow
the use of SQL accounts.


Resolution::
Change the Authentication Mode of the SQL server from "Windows Authentication Mode (Windows Authentication)"
to "Mixed Mode (Windows Authentication and SQL Server Authentication)".