The request failed with HTTP status 401: Unauthorized.accesing the server report in ssrs2008

Question

hi...

i've two system in which

1)windows server 2008 os

2)XP prof SP3 ..

In windows server 2008 i've created ssrs reports and deployed..(URL-- http://123.123.1.123:8080/reports) report

server url..

and in XP prof SP3 i've created an application in which reportviewer is present..

following is my code behind..

[code]

 MyReportViewer.ProcessingMode = Microsoft.Reporting.WebForms.ProcessingMode.Remote;

                MyReportViewer.ShowCredentialPrompts = true;

                MyReportViewer.ServerReport.ReportServerUrl = new Uri("http://IP:8080/reports";);

                MyReportViewer.ServerReport.ReportPath = "/sample/report";

                MyReportViewer.ServerReport.Refresh();

[/code]</pre>

when i execute the application 

the following error is displayed..

"The request failed with HTTP status 401: Unauthorized"

.. 

i've tried giving the " everyone" permission to the deployed folder in report manager..

but it is displaying the same message

please help me..