Hi,
The Symantec Endpoint Protection Manager supports two modes of SQL Server database authentication:
Microsoft SQL Server can be configured to use either Windows Authentication or Mixed mode authentication. Mixed mode authentication allows the use of either Windows or SQL Server credentials. When SQL Server is configured to use Mixed mode, Symantec Endpoint Protection Manager may be set to use either Windows Authentication or Mixed mode authentication. When SQL Server is set to use Windows Authentication mode, Symantec Endpoint Protection Manager must also be configured to use Windows Authentication mode.
You need to find out which mode you are implemented.
Refer this article to find out the info related to SQL you looking for:
About SQL Server configuration settings
http://www.symantec.com/docs/HOWTO26814