Service Principal Name (SPN)
Did you know that beginning with SQL Server 2008, support for service principal names (SPNs) has been extended to enable mutual authentication across all protocols. Administators can now define their own SPNs. Thus SQL Server 2008 makes secure authentication more manageable and reliable by allowing clients to directly specify the SPN to use.
Fore more information, click here:
SQL Server Protocols
Disclaimer: This posting is provided "AS IS" with no warranties, and confers no rights