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Part 2: The 32-Bit/64-Bit Drivers : The SQL Server Wire Protocol Driver : Advanced Features : Security : Authentication
  
Authentication
If you are using Kerberos, verify that your environment meets the requirements listed in the following table before you configure the driver for Kerberos authentication.1
Table 33. Kerberos Authentication Requirements for the SQL Server Wire Protocol Driver
Component
Requirements
Microsoft SQL Server database server
The database server must be administered by the same domain controller that administers the client and must be running one of the following databases:
*Microsoft SQL Server 2012
*Microsoft SQL Server 2008
*Microsoft SQL Server 2005
*Microsoft SQL Server 2000
*Microsoft SQL Server 2000 Enterprise Edition (64-bit) Service Pack 2 or higher
Kerberos server
The Kerberos server is the machine where the user IDs for authentication are administered. The Kerberos server is also the location of the Kerberos KDC. Network authentication must be provided by Windows Active Directory on one of the following operating systems:
*Windows Server 2012
*Windows Server 2008
*Windows Server 2003
*Windows 2000 Server Service Pack 3 or higher
Client
The client must be administered by the same domain controller that administers the database server.
1 Not supported for Microsoft Windows Azure for SQL Database. You must provide credentials every time when you connect to SQL Database.