为asp.net应用程序连接sql server (Windows身份验证vs sql server身份验证)的最佳方式

I have a database and a site having forms authentication. It is working fine with VS2008. This time, I am using "Trusted_connection =True". But when it is opened from outside or directly from browser then I am getting error "Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'."I have a database and a site having forms authe