[SQLObject] SQL Server Login Fails

What is the appropriate way to connect to a SQL Server database using
Windows Authentication? I've attempted using a connection string like this:

conn_string = mssql://HOSTNAME/Test

This results in:

adodbapi.adodbapi.DatabaseError: (-2147352567, 'Exception occurred.', (0,
u'Micr
osoft OLE DB Provider for SQL Server', u"Login failed for user 'None'.",
None, 0
, -2147217843), None)


I know the DB server is running, I am able to connect to it using Elixir /
SQL Alchemy ... Please help