Why runtime error occurs when 10 user concurrent request the same page?

Question

This page I use crystal report to generate a report, but if 10 user or more request this page at the same time, some of the user will get a runtime error.

But if normal use, everything is all right.

Sample code:

                report.Load(Request.PhysicalApplicationPath + "reports\\test.rpt");
            report.FileName = Request.PhysicalApplicationPath + "reports\\test.rpt";

            report.DataSourceConnections[0].SetConnection(Properties.Settings.Default.ReportServer, Properties.Settings.Default.ReportDatabase, Properties.Settings.Default.ReportUsername, Properties.Settings.Default.ReportPassword);
            report.ExportToHttpResponse(ExportFormatType.PortableDocFormat, Response, false, "Countries");

Answer 1

You're probably hosting the report on a consumer-level edition of Windows, such as XP or Vista.

Consumer-level Windows editions will not accept more than ten concurrent inbound connections.

You need to use Windows Server.