Secured connection

I am trying to connect to SQL server, I have a secured channel between my machine and the SQL server machine( IPC$ share ). When I tried to connect with Trusted_connection = TRUE in my connect string it is failing can any one please help me in this...?.


_ConnectionPtr Retval =
CreateInstance(__uuidof(Connection)));
_bstr_t ConStr = "Provider=SQLOLEDB;DATA SOURCE=\\MYMachineName;DATABASE=master;Connect Timeout=15;Trusted_Connection=Yes";

static _bstr_t EmptyBSTR;
Retval->Open(ConStr,EmptyBSTR,EmptyBSTR,0);