Microsoft Lync 2010 Server Error

Error: Error connecting to "hostname.yourdomain.com\ArchivingDB" while installing "ArchivingStore". Verify that the SQL instance is running, connections are not being blocked by a firewall, and that you have SQL administrator permissions. For details, see the following log file: "C:\Users\administrator\AppData\Local\Temp\2\Create-ArchivingStore-hostname.yourdomain.com_ArchivingDB-[2011_02_02][02_39_13].log"

Go to the SQL Server Configuration Manager --> SQL Server Network Configuration --> Protocol for your DB --> enable the TCP/IP