Hi All, I have developed FAX Application in ASP.NET 2.0 using FAXCOMLib in Windows 2003 Server Environment. My code is given below. Dim FS As New FAXCOMLib.FaxServer Dim FD As FAXCOMLib.FaxDoc FS.Connect(ServerToConnect.Trim()) FD = FS.CreateDocument(str_Path_Of_File_To_Be_Faxed.Trim) \\\file Name to be send FD.FileName = str_Path_Of_File_To_Be_Faxed.Trim FD.FaxNumber="45454545" FD.DisplayName = "TEST" FD.DiscountSend = 0 FD.SendCoverpage = 0 faxcnt = FD.Send() \\Error occurs Here FS.Disconnect() When i start this programm, the system seams to hang and after a short time, there appears an error 0x80070005 (Data is invalid??) at the line FaxDoc.Send() AS mentioned below {"Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))"} System.UnauthorizedAccessException: {"Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))"} Data: {System.Collections.ListDictionaryInternal} HelpLink: Nothing InnerException: Nothing Message: "Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))" Source: "Interop.FAXCOMLib" StackTrace: " at FAXCOMLib.IFaxDoc.Send() at FaxApplication.Upload_Files.FaxTheFiles() in F:\Inetpub\wwwroot\Fax2\Upload_Files.aspx.vb:line 160" TargetSite: {System.Reflection.RuntimeMethodInfo} One more thing I use the D-Link fax modem which does not have driver support on Windwos 2003 so does it require modem which support win 2003? I really required your help to solve this problem Thanks in Advance Mitesh