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I can connect to a Teradata db instance using a DSN entry.  When I reference that same DSN entry in an adodb connection string the .Open command generates the error "Not enough information to log on"  

    Dim conn As New ADODB.Connection


    conn.ConnectionString = "DSN=TDFADS_SYS" 




I can successfully connect to DB2 using my odbc files. But when I try it with Teradata I get the following error: