The Microsoft SQL Server can be discovered with SQL Authentication or Windows Authentication.

Microsoft SQL authentication

SQL authentication works for users having either SYSADMIN privileges or an unprivileged account.
Note: An unprivileged account can be created and used to discover the Microsoft SQL Server. Configuring the SolutionPack with an unprivileged account

Windows authentication

A Windows user account must be imported into the Microsoft SQL Server with settings similar to these:
  • Server role of Public
  • Securable grants for Connect SQL, View any definitions, and View server state