Event Log The request failed with HTTP status 401: Unauthorized. workstation to server fetch some reports

The request failed with HTTP status 401: Unauthorized.


   at Microsoft.SqlServer.ReportingServices2005.Execution.RSExecutionConnection.GetSecureMethods()
   at Microsoft.SqlServer.ReportingServices2005.Execution.RSExecutionConnection.IsSecureMethod(String methodname)
   at Microsoft.SqlServer.ReportingServices2005.Execution.RSExecutionConnection.LoadReport(String Report, String HistoryID)
   at Microsoft.Reporting.WinForms.ServerReport.GetExecutionInfo()
   at Microsoft.Reporting.WinForms.ServerReport.SetParameters(IEnumerable`1 parameters)
   at Accounting.Reports.UI.FormReportPreview.LoadReport()
   at Accounting.UI.FormBase.PreLoadReportComponents()




Please help me with this can't figure out, don't know how to troubleshoot this 5 days working on this error no changes so far, thanks in advance if u can figure it out....