ADODB - Trying to Open

[sdruley]

In the following,there is just one line of code I can't get right. Any ideas on this? I am trying to take a text string and upload it from my computer to an external server.
The error message is [Microsoft][ODBC Drive Manager] Data source name not found and no default driver specified

            If Range("upload") Then
            aa = Application.Range("GH14").Value
            bb = Format(Range("TOE"), "mm/dd/yyyy")
            cc = Format(Range("TOE"), "h:mm:ss")
            dd = Range("ver").Value
            InsertData aa, bb, cc, dd
            End If

Sub InsertData(ByVal strFirst As String, ByVal strSecond As String, ByVal strThird As String, ByVal strFourth As String)
    Dim conn As New ADODB.Connection
    Dim sql As String
       
    Set conn = New ADODB.Connection
    
    conn.Open "DFRSRainbow" ' THIS LINE OF CODE IS NOT RIGHT
    
    ' delete table contents
    sql = "DELETE FROM tradingdata;"
    conn.Execute sql
    
    ' write new entries using passed arguments
    sql = "insert into tradingdata (first,second,third,fourth) values ('" & strFirst & "','" & strSecond & "','" & strThird & "','" & strFourth & "');"
    conn.Execute sql
    
    ' clean up
    conn.Close
    Set conn = Nothing
End Sub