CR did not print after moving to web server

[adonet]

I have two app, APP_A and APP_B.
APP_A is in WEBSERVER and connected to the SQL server(SQL authentication) at the same machine: WEBSERVER. There is no problem to print crystal report.
APP_B is in WEBSERVER also but connected to the SQL server(Windows authentication) which is in different machine.
APP_B has problem to print crystal report but has no problem to bind data to datagrid.
WEBSERVER is Windows 2003, IIS 6.
When I program APP_B in my local pc, there is no problem to print crystal report.

I use code as bellow:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim rpt As New MyReport 'The report you created.
Dim myConnection As SqlConnection
Dim MyCommand As New SqlCommand
Dim myDA As New SqlDataAdapter
Dim myDS As New dstRpt 'The DataSet you created.
Dim MyConnectionString As String

MyConnectionString = ConfigurationSettings.AppSettings(WEBSERVER)
myConnection = New SqlConnection(MyConnectionString) 'from web.config
MyCommand.Connection = myConnection
MyCommand.CommandText = MYSQL
MyCommand.CommandType = CommandType.Text
myDA.SelectCommand = MyCommand
myDA.Fill(myDS, "tblOrder")
rpt.SetDataSource(myDS)
rpt.PrintToPrinter(1, False, 0, 0)
Me.crvOrder.ReportSource = rpt 'CR viewer
End Sub

If I bind to a test datagrid using myDS, I got data from SQL server which is in another machine. The only thing look like did not work is:

rpt.SetDataSource(myDS)