Domain Attribute Domain (DOM) Purpose Specifies the Windows domain that the driver uses when connecting to a SQL Server Instance. To connect to the database, users must supply the Windows User Id, Password, and, in some cases, domain to the driver. NTLM single sign on is not supported. Valid Values string where: string is a valid Windows domain for the user specified by LoginId. This attribute applies only when Authentication Mode is set to 9. Default None GUI Tab n/a