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it's error come out when try to connect oracle database with your oradirect.net for mobile

CoreLab.Oracle.OracleException was unhandled
ErrorCode=-2147483648
Message="Network error:: A socket operation encountered a dead network"
StackTrace:
at CoreLab.Oracle.i.ad()
at CoreLab.Oracle.u.c()
at CoreLab.Oracle.aw..ctor()
at CoreLab.Oracle.ad.e()
at CoreLab.Common.DbConnectionFactory.k()
at CoreLab.Common.DbConnectionPoolGroup.i()
at CoreLab.Common.DbConnectionPool.a()
at CoreLab.Common.DbConnectionPool.GetObject()
at CoreLab.Common.DbConnectionFactory.j()
at CoreLab.Common.DbConnectionClosed.Open()
at CoreLab.Common.DbConnectionBase.Open()
at CoreLab.Oracle.OracleConnection.Open()
at mobile1.form1.btnOK_Click()
at System.Windows.Forms.Control.OnClick()
at System.Windows.Forms.Button.OnClick()
at System.Windows.Forms.ButtonBase.WnProc()
at System.Windows.Forms.Control._InternalWnProc()
at Microsoft.AGL.Forms.EVL.EnterMainLoop()
at System.Windows.Forms.Application.Run()
at mobile1.form1.Main()

my code

Imports CoreLab.Oracle



Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim myConnString1 As String = "User Id=DD4U;Password=Programdd2009;port=1521;server=respos2009_sony;" 'Sid=respos20;"
Dim myConnection1 As New OracleConnection(myConnString1)
Try
myConnection1.Open()
Catch ex As CoreLab.Oracle.OracleException
MsgBox(ex.Message)
End Try
End Sub
End Class

A socket operation encountered a dead network.
This could indicate a serious failure of the network system (that is, the protocol stack that the Windows Sockets DLL runs over), the network interface, or the local network itself.

This link may be helpful (though the problem is with IIS server, it doesn't matter):
http://www.thescripts.com/forum/thread581606.html