Time Out issue, can I set the Ping Property?
You are probably looking for the KeepSessionAlive property of the ReportViewer control. To quote the linked MSDN page:


  ReportViewer.KeepSessionAlive Property
  
  Property Value
  true to keep the user session from expiring; otherwise, false. The default is true.
  
  Setting this property to true causes the ReportViewer control to keep the ASP.NET session from expiring if session is enabled in your ASP.NET application. Also, in remote processing mode, it causes the ReportViewer control to keep the report server session from expiring.


You should be able to set this property to false to prevent the keep-alive calls.